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[Subject]
A close-up portrait selfie of a young man with a shaved buzz cut, trimmed facial hair, relaxed smile, and direct eye contact, wearing a plain black crew-neck T-shirt, with one arm lifted casually above his head.

[Environment]
The photo is taken inside a parked or slow-moving car at night, with a dark headrest behind him, dim windows, soft city lights outside, and a low-visibility interior that keeps the focus on the face.

[Composition/Camera]
Front-facing smartphone selfie, tight chest-up crop, face centered and filling most of the frame, vertical social-media format, slight top-left arm intrusion, intimate conversational distance, natural asymmetry from the car seat and window edges.

[Lighting]
Direct phone flash or strong frontal fill creates glossy skin highlights across the forehead, nose, and cheeks, while the rest of the car interior falls into soft shadow; background remains dim with muted greenish night-light accents outside the window.

[Style/Rendering]
Photorealistic candid social portrait, realistic skin texture, modern casual lifestyle aesthetic, clean but unfiltered selfie energy, believable smartphone sharpness, minimal post-processing, confident everyday realism.

[Detail constraints]
Keep the smile subtle and natural, preserve realistic facial proportions, maintain the shaved haircut and light mustache-goatee definition, keep the black shirt plain, retain the visible car seat and nighttime window context, avoid glamour retouching, avoid studio polish, avoid fashion styling.

Negative prompt
studio backdrop, professional softbox lighting, heavy beauty retouching, airbrushed skin, exaggerated smile, extra accessories, sunglasses, jewelry, extra people, bright daytime exterior, luxury editorial styling, distorted selfie lens, cartoon face, text, watermark

Suggested parameters
- Model: photoreal portrait / smartphone lifestyle capable model
- Aspect ratio: 4:5 or 3:4
- Stylization: low
- Guidance: 6-7.5
- Skin detail: natural
- Lighting priority: direct flash realism with dim background retention

Delta prompt strategy
1. If the portrait feels too polished, add: “preserve casual smartphone selfie realism with natural skin texture and everyday imperfections.”
2. If the car setting disappears, add: “keep the headrest, window edge, and dim car interior clearly readable.”
3. If the smile becomes exaggerated, add: “use a restrained closed-mouth smile with calm confidence.”
4. If the lighting is too soft, add: “simulate direct frontal phone flash with crisp facial highlights.”
5. If the image looks daytime, add: “maintain nighttime ambience with faint exterior street lights through the window.”
6. If the face looks too wide, add: “use a flattering front-camera portrait crop without fisheye distortion.”
7. If the skin turns plastic, add: “restore realistic pores, natural sheen, and subtle tonal variation.”
8. If the frame feels empty, add: “include the raised forearm and car seat geometry for casual selfie context.”
9. If the subject lacks presence, add: “tighten the crop so the face dominates the frame.”
10. If the mood feels stiff, add: “keep the expression approachable, relaxed, and socially spontaneous.”