Sunlit window close-up portrait with a gentle, tender expression

Create a photorealistic 3:4 close-up smartphone portrait of a woman in her late 20s, sitting beside a sunlit window in a quiet, simple room. She has a sweet, charming and approachable appearance: a softly rounded oval face, warm fair skin, clear almond-shaped dark-brown eyes, gently curved eyebrows, a small delicate nose, soft cheeks and naturally full peach-pink lips. Her eyes look directly into the camera with a warm, affectionate gaze, while her lips form a very subtle closed-mouth smile. Her expression feels gentle, tender and slightly shy, not serious or seductive. Her dark-brown hair is gathered into a loose low bun with a deep side part. Long smooth side-swept bangs curve across her forehead and softly frame one cheek, with several fine flyaway strands glowing in the sunlight. She wears a delicate white lace choker with a small silver cross pendant. She wears a fitted opaque light-gray scoop-neck tank top with pale blue trim and a collegiate-style graphic across the chest. The fabric shows realistic stretch, seams and natural folds. Frame her from the top of her head to slightly below the chest. One arm rests horizontally beneath her chest, while her other hand is held loosely near her shoulder with softly curled fingers. Her head tilts slightly toward one shoulder, emphasizing the sweet, relaxed expression. Strong golden afternoon sunlight enters from the lower-left side, illuminating her hair, cheek, collarbones and hand while leaving soft shadows on the opposite side of her face. Warm-gray wall and a dark chair in the background, casual unposed phone photo, slightly imperfect exposure, visible skin pores, fine facial hairs and subtle phone-camera grain. No stern expression, no heavy makeup, no exaggerated smile, no doll-like face, no anime, no plastic skin, no distorted hands, no random text, logo, watermark or rounded image corners.