A realistic, close-range summer beach portrait in a vertical

A realistic, close-range summer beach portrait in a vertical 9:16 frame, with the casual texture of a smartphone photo. An unmistakably adult South Korea woman wears a deep burgundy thin-strap bikini with a visible side-tie bow. She lies on her stomach on a vivid blue beach towel spread over the sand, supporting her upper body on her forearms. She turns toward the camera with a calm, restrained half-smile. Her very dark brown, side-parted short bob softly frames her face; defined eyeliner, soft eyeshadow, and muted rose lips complete the look. Place the camera close to the towel, slightly below her face, for the perspective of an approximately 24–28mm equivalent wide lens. Her face sits in the upper-right portion of the frame, her near shoulder and arm fill the foreground, and her body and legs recede toward the left, naturally leaving the frame. Strong midday sunlight from above-left creates bright highlights on her shoulder and hip, with soft, believable shadows beneath. Keep natural skin tone and subtle skin texture, small folds in the fabric, and a few grains of sand on the towel in the foreground. A broad clear blue sky fills the background; only a narrow glimpse of sea and distant shoreline appears low on the left, with a faint streak of lens flare at the upper left. Let the framing feel slightly spontaneous, as if she had just settled down by the water and glanced up when the photographer approached. Avoid studio lighting, excessive retouching, exaggerated anatomy, busy scenery, text, and watermarks.