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[Subject] A single young adult woman with fair skin and a slim build taking a reflective selfie from inside a train at night. She is seated by the window with one knee bent up toward her chest, showing a white chunky sneaker near the lower left. She has long dark hair tied in a high ponytail, thin round wire-frame eyeglasses, large silver hoop earrings, and a bright relaxed smile. She holds a compact digital camera directly in front of her face with both hands; the camera flash is firing, creating a bright white burst at the center-top of the device and illuminating her face. She wears a fitted black sleeveless or strappy top and dark bottoms, giving the image a minimal nightlife-travel styling.

[Environment] Interior of a train carriage at night, viewed through the reflective window glass from outside or captured as a window reflection. Dark upholstered seats frame the subject on both sides. The train window has visible smudges, streaks, and surface reflections. Outside the train, warm yellow and white city or station lights streak horizontally across the lower half of the frame, suggesting motion. The upper background is dark, with the carriage interior softly visible behind the subject.

[Composition/Camera] Vertical square-ish portrait crop, medium shot capturing the subject from head to upper thighs while seated. The woman is centered, with the camera flash becoming the visual anchor near the top center. Reflections and motion streaks layer across the frame, especially in the lower third. Camera angle is straight-on to the window, using the glass as a compositional surface. Moderate lens feel around 35mm to 50mm equivalent, with enough clarity to keep the subject readable while preserving layered reflections.

[Lighting] Primary light comes from the on-camera flash, producing a candid direct-flash look with bright facial illumination, crisp catchlights, and a sharp highlight on the camera body and glasses. Ambient carriage light is warm and dim. Exterior lights create long horizontal streaks and soft bokeh smears due to movement and glass reflection. Overall effect is intimate, spontaneous, and documentary.

[Style/Rendering] Realistic candid travel-lifestyle photograph with indie nightlife energy, direct-flash snapshot aesthetic, layered reflection photography, visible window grime and motion blur, raw but polished enough for editorial social media. The image should feel personal, contemporary, and slightly nostalgic, like a train ride memory captured mid-journey.

[Detail constraints] Keep exactly one woman only, seated inside a train with one knee raised, holding a compact camera with flash firing. Preserve the window reflection, visible carriage seats, smudged glass texture, and warm horizontal light streaks outside. Keep glasses, hoop earrings, black outfit, white sneaker, and the centered flash burst. Do not clean up the reflections or turn the scene into a studio or bedroom mirror selfie.

Negative prompt: extra passengers visible, smartphone instead of camera, no flash, daylight train, clean studio glass, outdoor street portrait, missing glasses, different outfit color, no light streaks, distorted hands, duplicated camera, heavy beauty retouching, cartoon style, symmetrical polished ad look, airplane cabin, bus interior, empty black background.

Suggested parameters: aspect ratio 1:1 or 4:5, lens 40mm, aperture f/2.8 to f/4 look, moderate depth of field, 26-34 steps, CFG 6-7.5, sampler DPM++ 2M Karras or equivalent, style strength low, seed around 612903.

Delta prompt strategy:
1. If the flash disappears: add “compact digital camera with a bright direct flash firing straight into the window”.
2. If the train setting weakens: add “interior train seats visible behind the subject, captured through a carriage window at night”.
3. If the reflection effect is too clean: add “window glass with visible smudges, streaks, and layered reflections”.
4. If the outside motion is lost: add “warm horizontal city-light streaks across the lower frame, suggesting train movement”.
5. If the pose changes: add “seated by the window with one knee pulled upward, casual compact posture”.
6. If the camera turns into a phone: add “small handheld digital camera, not a smartphone”.
7. If the glasses are missing: add “round wire-frame eyeglasses clearly visible under direct flash”.
8. If the sneaker is lost: add “white chunky sneaker visible at the lower left near the raised knee”.
9. If the scene becomes too polished: add “raw candid direct-flash snapshot with travel nostalgia and imperfect reflective layering”.
10. If background darkens too much: add “dim warm carriage interior plus exterior station lights reflected across the window”.