# GPT Image Hub prompt

## Bản Phác Thảo Chân Dung Học Viện Bằng Than và Mực
- URL: https://www.gptimagehub.com/vi/library/academic-hand-drawn-charcoal-and-ink-portrait-sketch
- Generator URL: https://www.gptimagehub.com/vi/generate?promptId=oss-ym-mm-29970
- Markdown URL: https://www.gptimagehub.com/api/agent/markdown?path=%2Fvi%2Flibrary%2Facademic-hand-drawn-charcoal-and-ink-portrait-sketch
- Category: Áp phích và minh họa
- Model: nanobanana
- Aspect ratio: 9:16
- Style: painterly
- Tags: phac-thao, than-cui, muc-loang, chan-dung, but-chi, nghe-thuat-han-lam, giay-kraft
- Updated: 2026-10-26T18:57:28.098Z
- Created: 2026-10-26T18:57:28.098Z

Tạo bản phác thảo chân dung mỹ thuật bằng than củi, mực loang và chì trên giấy gân. Tùy chỉnh màu giấy và điểm nhấn sắc màu để đổi mới phong cách cổ điển.

### Full prompt
```text
Traditional hand-drawn portrait sketch technique executed on [aged warm off-white / cream beige kraft paper] with subtle visible paper fiber grain texture across the surface. Strict monochrome palette with [the clothes are given a soft dark green touch]: pure jet black, full rich range of soft gray tones, and natural cream paper color used as the brightest highlight value without pure white.

Line and medium technique:
- Balanced combination of smooth graphite pencil, soft smudged charcoal, and fluid black ink
- Hair rendered with dynamic, long, flowing directional brush and pencil strokes, loose stray wispy lines extending freely outside the form, varied line weights from razor-thin strands to bold dark masses
- Facial features drawn with refined, subtle contour lines that disappear and reappear naturally
- Clothing and lower areas rendered with bold, rough, angular, broken brush strokes with visible dry-brush texture dissolving into the paper
- Subtle construction sketch lines visible in lighter areas

Shading and washes:
- Broad, translucent, layered black ink washes and watered-down charcoal with soft bleeding edges in shadow areas
- Directional hatching and cross-hatching following three-dimensional form curvature
- Smooth blended charcoal gradients with seamless transitions on facial skin

Completion gradient:
- Central facial area is highly refined and realistically rendered
- Radiating outward and downward, the sketch gradually becomes looser, faster, rougher, and more abstract, dissolving naturally into bare paper with no hard border
- Expressive, confident, painterly fine-art academic sketchbook aesthetic
```