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[Subject] One female runway model, early-20s appearance, very slim/tall proportions, neutral serious expression, direct forward gaze, slicked-back dark hair tightly combed to head, minimal jewelry, pronounced cheekbone contour, smoky eye makeup. She walks toward camera with controlled catwalk posture, shoulders squared, left arm bent slightly holding a small black clutch near torso, right arm relaxed.

[Clothing and materials] Floor-length strapless black gown, body-hugging silhouette from bust to hips, then soft flare near lower hem. Fabric appears glossy crushed-velvet or wet-sheen stretch textile with irregular reflective streaks. No print, no bright accessories. Black pointed footwear mostly hidden by hem.

[Props and objects] Black clutch in left hand. Runway floor with subtle rectangular tile/wood plank pattern and reflective highlights. Audience seated along both sides in dim light; some hold smartphones visible as small bright screens. No stage backdrop branding visible.

[Environment] Indoor fashion show runway, low ambient light with haze/mist creating atmospheric depth. Purple-blue background fog at far end of runway. Audience forms tunnel-like corridor framing model.

[Composition/Camera] Vertical frame, full-body centered composition, eye-level or slightly low camera angle aligned with runway axis. Strong symmetry: audience on left and right creates converging leading lines toward model. Subject occupies majority of central vertical axis, with clean negative space above head in smoky background.

[Lighting] Frontal soft key from runway direction plus overhead fill; subtle rim separation from hazy backlight. Cool violet ambiance in distance, neutral-cool highlights on dress sheen. Shadows are soft due to haze diffusion. Lighting emphasizes fabric texture and body contour.

[Style/Rendering] High-fashion editorial runway photography, photoreal, crisp subject detail with background softness. Moderate grain, cinematic contrast, controlled highlights, premium magazine look.

[Detail constraints] Keep exactly one centered model in strapless black full-length gown, clutch in left hand, seated audience on both sides, smoky purple runway depth. Do not change to studio portrait or add logos/text.

Negative prompt: multiple models in front, colorful dress, heavy accessories, smiling pose, daylight outdoor scene, empty runway, overexposed highlights, cartoon/anime style, distorted anatomy, missing audience, short dress, handbag in wrong hand.

Suggested parameters: aspect ratio 4:5, lens 50-85mm feel (mild compression), depth of field shallow-to-medium, steps 35-45, CFG 5-7, sampler DPM++ 2M Karras, seed suggestion 7173004.

Delta prompt strategy (top drift fixes):
1) Dress length drifts -> "ankle-to-floor strapless black gown with slight hem pooling".
2) Fabric texture lost -> "glossy crushed velvet sheen with irregular reflective streaks".
3) Hair drifts loose -> "fully slicked-back hair, tight scalp contour, no loose strands".
4) Clutch missing -> "small black clutch held in left hand at waist level".
5) Runway symmetry breaks -> "audience seated on both left and right forming corridor".
6) Mood too bright -> "dim indoor show lighting with cool haze and soft diffusion".
7) Model expression changes -> "neutral serious runway expression, direct forward gaze".
8) Camera angle wrong -> "centerline runway perspective at eye-level".
9) Color cast drifts warm -> "background violet-blue fog with neutral-cool highlights".
10) Subject count drifts -> "single model only, no second walker in frame".