# GPT Image Hub prompt

## Chân Dung Phác Thảo Chì Siêu Thực
- URL: https://www.gptimagehub.com/vi/library/hyper-realistic-pencil-sketch-portrait
- Generator URL: https://www.gptimagehub.com/vi/generate?promptId=oss-ym-mm-2903
- Markdown URL: https://www.gptimagehub.com/api/agent/markdown?path=%2Fvi%2Flibrary%2Fhyper-realistic-pencil-sketch-portrait
- Category: Áp phích và minh họa
- Model: gpt-image-2-5-sunburst
- Aspect ratio: 4:5
- Style: painterly
- Tags: phác thảo chì, đơn sắc, chân dung, siêu thực, mỹ thuật, vẽ tay
- Updated: 2026-10-26T18:58:43.098Z
- Created: 2026-10-26T18:58:43.098Z

Tạo tranh chân dung chì đơn sắc chi tiết bằng cấu trúc tham số JSON. Thay đổi nhân vật, hướng nhìn hoặc ánh sáng để tùy chỉnh linh hoạt.

### Full prompt
```text
{
  "meta": {
    "image_quality": "High",
    "image_type": "Monochromatic Digital Illustration / Hyper-realistic Pencil Drawing"
  },
  "global_context": {
    "scene_description": "Studio portrait of [a woman]",
    "time_of_day": "Studio setting",
    "weather_atmosphere": "Serene and intimate",
    "lighting": {
      "source": "Studio lighting",
      "direction": "Frontal butterfly lighting",
      "quality": "Soft and diffused",
      "color_temp": "Neutral greyscale"
    }
  },
  "color_palette": {
    "dominant_tones": [
      "Charcoal",
      "Slate Grey",
      "Silver",
      "Deep Black",
      "Pure White"
    ],
    "contrast_level": "Medium"
  },
  "composition": {
    "camera_angle": "Eye-level",
    "framing": "Close-up headshot",
    "depth_of_field": "Shallow with soft focus on hair extremities and background",
    "focal_point": "Subject's eyes and the bridge of the nose"
  },
  "objects": [
    {
      "id": "obj_001",
      "label": "[Female Subject]",
      "category": "Person",
      "location": "Center",
      "prominence": "Foreground",
      "visual_attributes": {
        "color": "Full greyscale tonal range",
        "texture": "Smooth skin, fine hair strands, soft lip texture",
        "material": "Skin and hair",
        "state": "Posed",
        "dimensions_relative": "Occupies roughly 80% of the frame"
      },
      "micro_details": [
        "Individual wisps of flyaway hair catching soft light",
        "Subtle catchlights in the pupils of both eyes",
        "Finely rendered eyelashes and eyebrow hairs",
        "Soft philtrum indentation above upper lip",
        "Subtle graphite shading on neck and collarbones",
        "Smooth pencil gradient transitions on forehead and cheeks"
      ],
      "pose_or_orientation": "[Facing forward, direct eye contact]"
    },
    {
      "id": "obj_002",
      "label": "Background",
      "category": "Environment",
      "location": "Full frame",
      "prominence": "Background",
      "visual_attributes": {
        "color": "Dark grey to mid-grey gradient",
        "texture": "Grainy stippled pencil texture",
        "material": "Fine art sketch paper",
        "state": "Static",
        "dimensions_relative": "Full frame coverage behind subject"
      },
      "micro_details": [
        "Subtle graphite noise and paper grain throughout",
        "Soft vignette in the corners",
        "Subtle lighter halo effect immediately surrounding the head"
      ]
    }
  ]
}
```