1girl,mesugaki,early teen,loli,tan,slender,black hair,short hair,medium breasts,narrow_waist,giggling,classic old-style school swimsuit, white over-knee socks, lying on a white sofa with soft cushion compression, relaxed and slightly curled pose, one knee gently bent, holding a small cushion, slightly high angle, very close-up composition, direct eye contact, bright and innocent smile, soft natural daylight, warm and gentle lighting, shallow depth of field, creamy background blur, clean and cozy atmosphere, delicate smooth skin texture, slight pressure marks from socks, subtle fabric tension, fine micro highlights on skin and fabric, soft fluffy shadows, pastel color tones, high detail, well-balanced composition