Captivating Portrait of a Japanese Schoolgirl in Retro Train Carriage

a slim Japanese schoolgirl sitting upright on a pastel green train seat inside a retro-style train carriage, wearing a clean white long-sleeve sailor uniform with a dark navy blue sailor collar trimmed with two thin white lines, a dark pleated skirt ending exactly 6 centimeters above the knees with tight, evenly folded pleats that remain flat while seated, no exaggeration her body is petite and proportional to a 15-year-old, short stature around 150 cm, flat chest with no visible bust definition, narrow shoulders, delicate arms, slim waist with a natural curve, not hourglass, slim thighs touching, knees close together, posture straight and modest her facial expression is nonchalant and mildly serious, with no smile, no frown, and no obvious emotion, eyes looking slightly away from the viewer without making direct eye contact, eyelids relaxed, lips closed gently, skin smooth and pale without makeup she has long straight black hair that reaches the lower back, evenly cut bangs that cover the forehead to the eyebrows, no flyaways or wind movement, hair falls naturally along the sides of her face and over her shoulders she holds one hand gently near her ribbon or collar, and the other rests relaxed on her lap, fingers naturally posed, all fingers present, no distortions lighting is soft daylight coming from a rounded train window behind or beside her, creating subtle shadows and ambient highlights on her skin and uniform, no harsh lighting, no lens flare scene is empty, only one girl in the frame, no background characters, no reflections of other people, no crowd semi-realistic anime style, full body, ultra-detailed fabric folds, clear limb separation, smooth body contour, natural human anatomy with correct proportions, no missing or extra fingers