# GPT Image Hub prompt

## Digital Twin Portrait on Stone Stairs
- URL: https://www.gptimagehub.com/library/digital-twin-portrait-on-stone-stairs
- Generator URL: https://www.gptimagehub.com/generate?promptId=oss-ym-mm-10958
- Markdown URL: https://www.gptimagehub.com/api/agent/markdown?path=%2Flibrary%2Fdigital-twin-portrait-on-stone-stairs
- Category: Portrait & Photography
- Model: gpt-image-2-5-sunburst
- Aspect ratio: 3:4
- Style: photorealistic
- Tags: digital twin, portrait photography, json prompt, anatomical, hyperrealistic, fashion
- Updated: 2026-10-26T18:25:04.341Z
- Created: 2026-10-26T18:25:04.341Z

Generates an anatomically precise portrait formatted in JSON featuring high-fidelity textures on stone stairs. Swap the biometric reference or wardrobe details to model different subjects.

### Full prompt
```text
{
  "subject": {
    "identity": {
      "biometric_reference": "[Sabrina Carpenter]",
      "forensic_fidelity_level": "1.0 (Digital Twin)",
      "facial_morphology": {
        "structure": "Heart-shaped facial architecture with defined zygomatic arches and soft mandibular line",
        "eyes": {
          "iris_pattern": "Highly detailed blue-green iris stroma with distinct pupillary zone and pigmented crypts",
          "anatomy": "Lateral canthal tilt, well-defined supraorbital ridges, and dense natural eyelashes",
          "color_hex": "#A1C4D0"
        },
        "nose": {
          "morphology": "Straight nasal bridge with refined, slightly upturned apex and symmetrical alar base"
        },
        "skin": {
          "texture": "Visible follicular pores, fine epidermal micro-lines, no artificial airbrushing or smoothing",
          "tone_hex": "#F9E4D6",
          "physics": "Subsurface scattering with realistic vascular undertones"
        }
      }
    },
    "body": {
      "somatotype": "Ecto-mesomorphic, petite frame scaled to 151cm height equivalent",
      "proportions": {
        "waist_to_hip_ratio": "0.7 anatomical accuracy",
        "shoulder_width": "Narrow, natural clavicle definition",
        "muscle_density": "Lean tone in posture and structure"
      },
      "limbs": {
        "hands": "Detailed phalanges, natural nail beds, anatomical joint creases",
        "feet": "Anatomically correct metatarsal structure resting naturally on stone stairs"
      }
    },
    "hair": {
      "style": "Long, voluminous wavy blonde texture with curtain bangs",
      "physics": "Individual strand rendering with anisotropic highlights",
      "color_hex": "#E6D2A0"
    },
    "wardrobe": {
      "base_layer": "[Black silk-satin midi dress] with modest neckline and elegant knee-length hemline",
      "outer_layer": "[Heavy-gauge black knit oversized cardigan] draped comfortably around shoulders",
      "material_science": "Specular sheen on satin contrasted against matte light absorption on wool knit",
      "accessories": "[Thin silver bracelet] on right wrist"
    },
    "pose_action": {
      "description": "Seated on weathered stone stairs, body angled slightly toward camera, left hand resting against cheek in a pensive neutral expression, right arm resting comfortably across knees, calm gaze with mouth closed",
      "posture": "Asymmetric relaxed seated pose on stone steps, seated naturally with skirt draped elegantly"
    }
  }
}
```