Muted Editorial Portrait with Flowing Ribbon

这是一次针对高端时尚编辑风格棚拍人像的反向提示工程任务，目标输出为工程级可控参数。所有数值均从图像中推断，可作为可调节目标。重点关注构图、丝带的运动与景深、服装结构，以及低饱和电影感调色。

画面为纵向构图，比例 4:5，中近景人像裁切，头部留白紧凑，画面下方裁至胸部以下。主体位于画面中央略微偏右，背景为纯色，左侧留出空间用于丝带运动。前景中有一条丝带形成 S 型引导线，从颈部左侧延伸至画面左下方，用于增强纵深与动感。

相机位置略低于眼平线，垂直角度约 -5°，使用 85mm 人像镜头风格，f/1.8 光圈，低 ISO，中等快门速度，使丝带呈现轻微运动模糊而非完全冻结。对焦点在面部皮肤平面，景深浅，前景丝带有中等虚化，背景为低到中等虚化。

拍摄对象为 20–25 岁年轻女性，正面对镜头，肩部放松，头部微微后仰（俯仰约 12°），双眼闭合，表情冷静疏离，下巴略微抬起。发型为中长直发，接近中分的齐刘海，灰棕偏冷色调；妆容自然极简、低对比、哑光质感；肤色为偏冷中性浅色，皮肤细节清晰，油光控制良好。

服装为深炭灰色宽松剪裁西装外套，肩部结构感强，腰部放松，深 V 领口，不强调翻领，面料为哑光羊毛感。配饰为白色半透明欧根纱丝带颈饰，位于颈部左侧，松散蝴蝶结系法，双尾较长，在轻柔从右向左的风力作用下前景飘动，形成 S 曲线路径，并带有轻微运动模糊，但不遮挡主体面部。

环境为摄影棚，无道具，背景是中性偏暖的灰色无缝背景纸，无纹理，仅有极轻微渐变。灯光为单一大型柔光箱主光加环境补光，主光位于正前方偏高位置，光线包裹性强，对比度低，阴影柔和，下巴阴影极少，皮肤与布料高光均被抑制。

整体色彩风格为低饱和、编辑感、电影级调色，白平衡略偏冷但色调中性，全局降低饱和度与对比度，轻微降低清晰度、提升纹理，暗部略提亮，高光压低，整体偏灰米基调，避免暖橙肤色和鲜艳颜色。添加极低强度颗粒与轻微暗角。渲染风格为高端时尚杂志级写实摄影，背景极简，丝带是唯一强烈的前景与动态元素。

{
  "meta": {
    "task": "reverse_prompt_engineering",
    "target": "studio_fashion_editorial_portrait",
    "output": "engineering_grade_controls",
    "language": "en",
    "notes": [
      "All values are inferred from the image; treat numeric fields as controllable targets.",
      "Focus: composition + ribbon motion/DOF + wardrobe structure + muted cinematic grade."
    ]
  },
  "frame": {
    "orientation": "portrait",
    "aspect_ratio": "4:5",
    "shot_type": "medium_close_up",
    "crop": {
      "top_margin": "tight_headroom",
      "bottom_cut": "below_chest",
      "left_margin": "medium",
      "right_margin": "medium"
    },
    "composition": {
      "subject_position": {
        "anchor": "center",
        "offset": {
          "x": 0.06,
          "y": 0.00
        }
      },
      "negative_space": {
        "background_fill": "solid",
        "space_bias": "left_for_ribbon_motion"
      },
      "leading_lines": [
        {
          "type": "foreground_ribbon",
          "path": "S_curve",
          "direction": "neck_left_to_lower_left",
          "purpose": "depth_and_motion"
        }
      ]
    }
  },
  "camera": {
    "camera_height": "slightly_below_eye_level",
    "vertical_angle_deg": -5,
    "horizontal_angle_deg": 0,
    "distance": "portrait_distance",
    "lens": {
      "focal_length_mm": 85,
      "look": "portrait_tele"
    },
    "exposure": {
      "aperture_f": 1.8,
      "shutter": "moderate",
      "iso": "low",
      "notes": [
        "Shutter not ultra-fast; ribbon shows slight motion blur (not frozen)."
      ]
    },
    "focus": {
      "focus_target": "face_skin_plane",
      "depth_of_field": "shallow",
      "foreground_blur": {
        "enabled": true,
        "target": "ribbon",
        "strength": "medium"
      },
      "background_blur": {
        "enabled": true,
        "strength": "low_to_medium"
      }
    }
  },
  "subject": {
    "type": "young_woman",
    "age_range": "20-25",
    "pose": {
      "body_orientation": "front_facing",
      "shoulders": "relaxed",
      "head_tilt": {
        "pitch_deg": 12,
        "yaw_deg": 0,
        "roll_deg": 0
      },
      "eyes": "closed",
      "expression": "calm_detached",
      "chin": "slightly_up"
    },
    "appearance": {
      "hair": {
        "style": "straight",
        "length": "medium_long",
        "bangs": "blunt",
        "part": "near_center",
        "color": "ash_gray_brown",
        "texture": "smooth"
      },
      "makeup": {
        "style": "natural_minimal",
        "contrast": "low",
        "finish": "matte"
      },
      "skin": {
        "tone": "pale_neutral_cool",
        "texture_detail": "high",
        "shine": "controlled_low"
      }
    }
  },
  "wardrobe": {
    "outerwear": {
      "item": "oversized_tailored_blazer",
      "color": "dark_charcoal",
      "fit": {
        "silhouette": "oversized",
        "shoulders": "structured_wide",
        "waist": "relaxed"
      },
      "lapel": "not_emphasized",
      "neckline": {
        "shape": "deep_V",
        "depth": "high"
      },
      "fabric": {
        "type": "wool_like_suiting",
        "surface": "matte"
      }
    },
    "accessory": {
      "item": "sheer_ribbon_choker",
      "material": "organza",
      "color": "soft_white",
      "position": "left_side_of_neck",
      "knot": "loose_bow",
      "tails": {
        "count": 2,
        "length": "long",
        "behavior": "wind_swept"
      }
    }
  },
  "dynamic_elements": {
    "wind": {
      "enabled": true,
      "strength": "gentle",
      "direction": "from_right_to_left",
      "effect_targets": [
        "ribbon_tails"
      ]
    },
    "ribbon_motion": {
      "path_shape": "S_curve",
      "foreground_depth": "closer_than_face",
      "motion_blur": {
        "enabled": true,
        "amount": "subtle"
      },
      "occlusion": {
        "covers_subject": "no",
        "crosses_frame": "yes",
        "foreground_presence": "strong"
      }
    }
  },
  "environment": {
    "location": "studio",
    "background": {
      "type": "seamless_paper",
      "color": "neutral_warm_gray",
      "texture": "none",
      "gradient": "very_subtle"
    },
    "props": "none"
  },
  "lighting": {
    "setup": "single_key_softbox_plus_fill",
    "key_light": {
      "type": "large_softbox",
      "position": "front_high",
      "angle": {
        "horizontal": 0,
        "vertical": 35
      },
      "quality": "very_soft",
      "wrap": "high"
    },
    "fill": {
      "type": "bounced_or_ambient",
      "amount": "medium",
      "purpose": "reduce_contrast"
    },
    "shadow": {
      "hardness": "soft",
      "contrast": "low",
      "under_chin": "minimal"
    },
    "specular_control": {
      "skin_highlights": "suppressed",
      "fabric_highlights": "low"
    }
  },
  "color_grade": {
    "style": "editorial_muted_cinematic",
    "white_balance": {
      "temperature": "slightly_cool",
      "tint": "neutral"
    },
    "global": {
      "saturation": -20,
      "contrast": -10,
      "clarity": -5,
      "texture": 5,
      "dehaze": 0
    },
    "tones": {
      "highlights": -15,
      "shadows": 5,
      "whites": -10,
      "blacks": 8
    },
    "color_bias": {
      "overall": "gray_beige_base_with_cool_skin",
      "avoid": [
        "warm_orange_skin",
        "vivid_colors"
      ]
    },
    "grain": {
      "enabled": true,
      "amount": "very_low"
    },
    "vignette": {
      "enabled": true,
      "amount": "subtle"
    }
  },
  "rendering_style": {
    "medium": "photorealistic",
    "genre": "high_fashion_editorial",
    "detail": "high",
    "cleanliness": "ultra_clean",
    "bokeh": "creamy",
    "notes": [
      "Keep background simple; the ribbon provides the only strong motion/foreground layer."
    ]
  },
  "prompt_payload": {
    "positive_prompt": "minimalist high fashion editorial studio portrait of a young woman, medium close-up, vertical composition, subject centered slightly to the right, camera slightly below eye level, subtle low angle view, head gently tilted back, eyes closed, calm and detached expression, relaxed posture, straight medium-long ash gray brown hair with blunt bangs, natural minimal makeup, smooth matte pale skin, wearing an oversized dark charcoal tailored blazer with deep V neckline, structured shoulders, white sheer organza ribbon choker tied loosely around the neck, long translucent ribbon flowing forward into the foreground, soft S-curve motion, slight motion blur on ribbon, clean neutral warm gray studio background, soft diffused studio lighting from front and above, very low contrast, soft shadows, shallow depth of field, foreground ribbon slightly out of focus, realistic photography, high detail skin texture, cinematic muted color grading, desaturated tones, editorial fashion magazine style, 85mm lens look, f1.8, ultra clean composition",
    "negative_prompt": "cartoon, anime, illustration, painterly, heavy makeup, glossy oily skin, harsh shadows, hard rim light, cluttered background, busy patterns, neon colors, warm orange skin, wide angle distortion, extreme bokeh artifacts, extra accessories, jewelry, text, watermark, logo, lowres, blurry face"
  },
  "control_knobs": {
    "must_match": [
      "eyes_closed",
      "head_tilt_back",
      "oversized_dark_charcoal_blazer_deep_V",
      "white_sheer_ribbon_choker_left_side",
      "foreground_ribbon_S_curve_motion",
      "neutral_warm_gray_seamless_background",
      "soft_diffused_low