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[Subject] One young woman in her early 20s sitting at a dressing-room vanity while someone off-camera applies lipstick to her mouth. She has fair skin, a slim build, large round clear eyeglasses, dark hair in a high ponytail, and medium hoop earrings. She smiles brightly at the camera with a lively, ready-for-the-night expression. She wears a black off-the-shoulder fitted top and a dark denim mini skirt. Her seated posture leans slightly forward and to the side, casual but posed enough to feel like a backstage snapshot.

[Other visible people] Only a cropped arm and hand of a makeup artist or friend should be visible from the right side, holding a lipstick near the subject’s lips. In the mirror reflection, part of the helper’s upper body may be faintly visible, but the main woman remains the central subject.

[Environment] Backstage dressing room or vanity area with a large rectangular mirror framed by round exposed light bulbs. The bulbs should glow warmly and brightly, creating a classic makeup-room look. A white vanity table sits below the mirror. The mirror may catch a direct camera flash hotspot near its center-right. The overall room should feel simple, intimate, and slightly retro, like an old backstage prep area or 1980s dressing room.

[Composition/Camera] Vertical 4:5 medium portrait from about upper thigh to head. The subject is seated slightly left of center, with the vanity mirror and bulb frame taking up most of the background. The helper’s hand enters from the right edge. Keep the mirror reflection visible enough to deepen the scene, but not so dominant that it steals focus from the subject’s face.

[Lighting] Strong direct flash or snapshot-style frontal light combined with the bright vanity bulbs. The flash should flatten the scene slightly in a charming analog way, while the bulbs add glowing ambience and recognizable dressing-room context. The result should feel like a candid behind-the-scenes beauty moment, not soft studio glam.

[Style/Rendering] Photorealistic retro backstage snapshot photography with 1980s dressing-room energy. Preserve the direct-flash realism, bright bulb mirror frame, denim and knit fabric textures, and lightly imperfect candid charm. The mood should feel playful, feminine, and pre-performance.

[Detail constraints] Keep exactly one main woman seated at one vanity mirror, plus only a cropped helper hand from the right. Preserve the glasses, high ponytail, hoop earrings, black off-shoulder top, denim mini skirt, and lipstick touch-up action. Do not add elaborate studio gear, extra full faces, modern ring lights, smartphones, or excessive glam props. This must remain a modest retro dressing-room prep image.

Negative prompt: modern ring light, smartphone selfie, extra fully visible makeup artists, oversized glam kit, runway stage, softbox studio setup, missing glasses, different outfit colors, no bulb mirror, anime style, watermark, text overlay

Suggested parameters:
- Aspect ratio: 4:5
- Lens / focal length: 35mm to 50mm equivalent
- Depth of field: moderate, subject and vanity readable
- Steps: 30-40
- CFG / style strength: 6.5-8
- Sampler: DPM++ 2M Karras or equivalent
- Seed suggestion: 381228527

Delta prompt strategy:
1. If the dressing-room vibe weakens: “vanity mirror framed by bright exposed bulbs in a simple backstage prep room”
2. If the flash look disappears: “direct frontal snapshot flash with slight mirror hotspot and retro candid lighting”
3. If the subject identity drifts: “young woman with round glasses, high ponytail, hoop earrings, bright lipstick smile”
4. If the outfit changes: “black off-the-shoulder fitted top and dark denim mini skirt”
5. If the helper interaction is lost: “cropped hand from the right applying lipstick at the corner of her mouth”
6. If the image becomes too modern: “old-school dressing-room prep scene, no ring lights or phones”
7. If the mirror reflection disappears: “subtle reflection of the helper and vanity in the bulb-framed mirror”
8. If the scene becomes too polished: “charming imperfect backstage snapshot, not editorial studio beauty”
9. If extra people appear: “one main woman only, helper visible only as partial arm/hand”
10. If realism drops: “photoreal bulb glow, denim texture, skin detail, and vanity reflection”