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[Subject]
A photorealistic mirror selfie portrait of a young woman standing in an ornate underground metro station, smiling warmly toward her phone while capturing her reflection. She has long dark brown to black hair tied in a high ponytail, large round eyeglasses, softly defined brows, and a cheerful, relaxed expression. She wears a black puffer jacket layered over a blue knit sweater with a winter fair-isle pattern, plus a soft mauve-gray scarf wrapped loosely around her neck. She holds a dark smartphone up near face height with one hand while the other arm rests naturally by her side or within the jacket silhouette. The overall feeling is candid, friendly, and everyday stylish.

[Environment]
An elegant classical metro station interior with cream and beige marble columns, arched vaulted ceilings, chandelier-style hanging lights, tiled floors, and train cars visible along the platform edges. The subject is seen via a large round or oval framed mirror with a brass or gold-toned border, which creates the selfie composition. A few commuters appear in the background, softly secondary, helping the space feel real and active without becoming crowded. The station should feel grand, symmetrical, and historic rather than modern-minimal.

[Composition/Camera]
Vertical mirror-selfie composition centered on the subject inside the reflection, with the gold-toned mirror frame visible along the lower and side edges. Camera perspective is defined by the phone held in the reflection, producing a familiar casual selfie feel, while the metro hall extends behind her in symmetrical depth. Keep the face, scarf, sweater pattern, and architectural ceiling rhythm all readable. The subject should dominate the middle of frame, with the background providing strong location identity and winter-travel atmosphere.

[Lighting]
Soft warm indoor ambient lighting from chandeliers and station fixtures, evenly illuminating the face and clothing while preserving gentle highlights on the marble surfaces and mirror frame. No harsh flash, no nightclub color cast, no dramatic shadows. The light should feel naturally flattering and realistic for a large public transit interior.

[Style/Rendering]
Photorealistic urban lifestyle selfie, casual travel portrait, authentic winter fashion realism, everyday social-media capture with premium environmental architecture, realistic skin texture, believable smartphone reflection, soft candid smile, grounded documentary warmth. Not anime, not CGI, not 3D render, not fashion-campaign over-retouching. The goal is elevated realism, not stylized fantasy.

[Detail constraints]
Preserve the ornate metro architecture, marble columns, arched ceiling, chandeliers, mirror frame, winter layers, glasses, ponytail, and phone-in-hand reflection. Keep the expression warm and real. The commuters and train cars should stay secondary. Avoid excessive blur, plastic skin, distorted mirror perspective, empty station vibe, or hyper-stylized beauty filters. The image should feel like a real winter city moment captured casually in a beautiful public space.

Negative prompt:
anime, cartoon, CGI, 3D render, broken reflection, warped mirror frame, deformed hand, extra fingers, fake smile, beauty filter skin, neon cyberpunk station, empty hall, no commuters, airport terminal, office lobby, low resolution, text, watermark, logo, heavy flash, dramatic shadows, fashion editorial pose, sunglasses, hat, cluttered luggage, fantasy station, muddy colors, over-sharpening

Suggested parameters:
photorealistic mirror selfie, ornate metro station interior, warm ambient chandelier light, winter casual outfit, realistic skin texture, smartphone reflection, round glasses, high ponytail, marble architecture, candid travel-lifestyle realism, centered composition, soft natural smile

Delta prompt strategy:
1. If the station loses identity, reinforce marble columns, vaulted ceiling, chandeliers, tiled floor, and visible train cars.
2. If the selfie feel weakens, specify mirror reflection composition with the phone raised near the face.
3. If the portrait becomes over-styled, push back toward candid everyday winter travel realism.
4. If the outfit changes, restate black puffer jacket, blue patterned knit sweater, and mauve-gray scarf.
5. If the face becomes glamorized, reduce retouching and preserve a natural cheerful smile behind round glasses.
6. If the mirror frame disappears, emphasize gold-toned circular or oval mirror border as part of the composition.
7. If the background becomes empty, add a few commuters and a metro train while keeping them secondary.
8. If lighting turns harsh, force warm soft public-interior ambient illumination.
9. If the scene drifts from metro to generic hall, restore underground station atmosphere and platform context.
10. If the image loses realism, add authentic social-media selfie behavior, believable reflection, and grounded urban travel mood.