黒ビキニのサイズ確認、朝の側臥セルフィー

Candid unpolished iPhone front-camera selfie of an early-20s adult Japanese woman indoors in summer, checking the fit of a newly bought black bikini-style swimsuit to send to a friend. Natural SNS lifestyle snapshot, not advertising, not gravure, not studio.

She is lying on her side (side-lying) in a lived-in simple room with plain white wallpaper; a plain interior door and a small wall shelf barely visible at the edge. Soft morning natural light from the right, gentle shadows, slight local highlight blowout from window light and mild overhead light, natural phone HDR tone curve.

Face is the hero of the frame: soft natural makeup, cute soft adult Japanese face, warm gentle smile while looking at the phone screen (eyes slightly off-lens / mid-selfie check). Dark brown semi-long hair lightly half-tied with a few loose strands; bangs slightly clumped from humidity. Small silver earrings. Healthy natural skin with visible pores and micro-texture, no beauty-filter porcelain, no plastic AI sheen; mild phone sensor noise and light SNS compression.

Outfit: black bikini-style swimwear with a large central knot at the bust and soft frilly fabric accents; fabric follows the body with realistic tension and slack from the side-lying pose—gravity pull, natural wrinkles, cloth stretch and drape catching soft indoor light. Strong full bust volume reads as clothing fit and fabric structure (thickness of chest wall, dimensional depth shoulder-to-bust under cloth), not as a body-part crop or push-up ad pose. Mild foreshortening from arm-length front-camera distance.

Holding a smartphone with a cute moderately decorated greige phone case in the selfie hand. Vertical 2:3 portrait composition, arm-length distance, slight handheld tilt, slight wide-angle phone look, soft not razor focus, mild motion softness. Composition leads eye from face → hair → black swimwear → central knot → natural silhouette. Breathing room, casual mid-prep atmosphere, real home morning air.

Avoid: unnatural body proportions, extreme close-up on body only, overt sexual posing, heavy push-up artificial lift, polished ad photography, gravure lighting, wax/plastic skin, over-retouch, extreme wide-angle face distortion, celebrity lookalike face, brand logos or readable text watermarks, anime look, doll-stiff pose, melted fabric or straps.