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[Subject] One female-presenting virtual influencer (young adult) taking an arm-length selfie in a busy convention hall. Pose: both arms extended toward camera edges, broad smile, direct eye contact. Hair: blunt fringe with two compact side buns. Outfit: fitted long-sleeve V-neck top with pink-and-white zebra stripe pattern.

[Environment] Large indoor conference/expo atrium with high ceiling, recessed spotlights, wood-paneled side walls, directional/brand signage bands along both sides, exhibition booths, and a crowd of attendees wearing lanyards.

[Props/objects] Smartphone implied by selfie perspective (not visible). Background includes event walls, digital panels, iconography, and people in business-casual attire.

[Composition/Camera] Vertical 4:5 selfie framing. Subject occupies center foreground from chest up; extended forearms create converging leading lines toward camera. Hallway perspective recedes deeply behind subject with symmetrical architecture.

[Lighting] Mixed indoor overhead lighting with even exposure on face, moderate contrast, neutral color temperature. Background slightly darker but still detailed.

[Style/Rendering] Photoreal event-selfie aesthetic, social-media candid with clear foreground subject and documentary convention context.

[Detail constraints] Keep one smiling foreground subject in pink zebra V-neck top, selfie arms visible from both sides, crowded convention hall with signage and attendees in background. Preserve central alignment and depth.

Negative prompt: empty hall, outdoor setting, no crowd, studio backdrop, outfit color change, long loose hair, dramatic cinematic shadows, cartoon style, heavy blur, watermark text.

Suggested parameters: aspect ratio 4:5 (1080x1350), lens 24-26mm equivalent selfie perspective, aperture look f/3.5-f/5, ISO 320-640 indoor, shutter 1/160s, steps 28-36, CFG 5-6.5, sampler DPM++ 2M Karras, style strength 0.2-0.35, seed suggestion 225703184.

Delta prompt strategy (top drift fixes):
1) If selfie feel lost -> "both forearms extended toward camera edges in arm-length selfie pose".
2) If crowd disappears -> "busy convention hall with many attendees and lanyards".
3) If outfit drifts -> "pink-and-white zebra stripe long-sleeve V-neck top".
4) If hair changes -> "blunt bangs with two side buns".
5) If architecture flattens -> "tall atrium with symmetrical side signage and deep corridor perspective".
6) If expression neutralizes -> "big friendly smile facing camera".
7) If lighting too dramatic -> "even overhead expo lighting with neutral tones".
8) If crop too tight -> "include upper torso and both outstretched arms".
9) If scene becomes staged studio -> "real convention floor documentary background".
10) If extra foreground people block subject -> "single clear foreground subject centered".