{
  "master_prompt": {
    "scene_type": "fine-art cinematic monochrome studio portrait",
    "reference_requirement": {
      "identity_match": "precisely match the uploaded reference image",
      "facial_structure_accuracy": [
        "bone structure",
        "eye shape",
        "nose proportions",
        "jawline definition",
        "facial symmetry",
        "hairline",
        "beard density if present"
      ],
      "skin_texture": "authentic natural skin texture with visible pores and fine lines",
      "no_artificial_smoothing": true
    },
    "subject": {
      "type": "mature confident man",
      "expression": {
        "mood": "serious, contemplative, quietly authoritative",
        "gaze": "deep-set eyes looking directly into the camera",
        "emotion": "focused and introspective, not aggressive"
      }
    },
    "facial_hair": {
      "adaptive": true,
      "rules": [
        "replicate beard exactly if present",
        "match density, length, shape, and edges",
        "preserve natural tonal variation including salt-and-pepper if visible",
        "beard lines clean and structured"
      ],
      "clean_shaven_rule": "if clean-shaven, emphasize natural jawline definition and skin texture"
    },
    "hairstyle": {
      "adaptive": true,
      "requirement": "match hairstyle from reference image exactly",
      "details": [
        "same volume",
        "same direction",
        "same hairline",
        "natural strand texture",
        "subtle specular highlights from overhead lighting"
      ]
    },
    "pose": {
      "style": "classic thinker pose",
      "description": [
        "one hand raised to chin",
        "thumb along the jawline",
        "index finger slightly curled",
        "knuckles and tendons subtly defined",
        "hand in sharp focus with natural skin texture"
      ]
    },
    "lighting": {
      "style": "low-key fine-art studio lighting",
      "contrast": "high contrast but refined tonal control",
      "key_light": {
        "position": "slightly above eye level",
        "direction": "toward viewer's left angled downward",
        "type": "large softbox or diffused beauty dish",
        "effect": "strong top-plane highlights with crisp edge definition"
      },
      "highlight_focus": [
        "forehead center",
        "nose bridge",
        "upper cheekbones",
        "beard texture",
        "top planes of the hand"
      ],
      "shadow_control": [
        "subtle shadow shaping under brow ridge",
        "defined cheekbone shadow",
        "deep but detailed shadow side",
        "midtone detail preserved"
      ],
      "fill_light": {
        "position": "minimal fill from front-center",
        "purpose": "maintain facial symmetry while preserving depth"
      },
      "rim_light": {
        "intensity": "very subtle",
        "location": "hair edges and outer shoulder",
        "purpose": "separate subject from black"
      }
    }
  }
}