Realistic Smartphone Selfie in Stairwell

3:4 vertical ultra-realistic smartphone selfie of a adult East Asian woman in an old apartment stairwell. She holds the phone at arm's length and gives a soft, natural closed-lip smile. Dark-brown almond eyes, natural ivory skin texture, loose low ponytail with wispy fringe. She wears an ivory-white strapless rib-knit crop top, high-waisted washed-blue jeans, silver earrings and a delicate pendant, with a denim jacket folded over her left arm. Cool daylight from a stairwell window creates soft natural highlights and realistic shadows. Worn concrete stairs, muted blue-gray walls and aged handrail in the background. Realistic 26mm front-camera perspective, subtle smartphone sharpening, natural skin texture, slight noise and authentic selfie feel. No logos, text, people or interface graphics.