Create a vertical 3:4 extreme close-up seaside portrait of a clearly adult East Asian woman, age 21, with fair neutral skin, a softly tapered oval face, straight dark brows, large dark almond eyes, a small straight nose, glossy pink lips, and long dark-brown hair falling along both sides of her neck. She looks directly at the camera with a playful open smile while the tip of her tongue briefly touches her upper lip in a lighthearted, non-sexual teasing gesture. Her left hand cups the side of her mouth as if sharing a secret; fingers are slender with short pale-lilac nails. Only the thin ivory halter strap and the secure opaque upper edge of her swimsuit are visible at the very bottom-right. The primary visual line is eyes-to-mouth-to-hand; the body is incidental and never centered. Use an intimate arm-length camera, slight high angle, portrait crop from upper chest to crown, and a uniform softly blurred blue sea background. Render cool blue-hour ambient light with a gentle warm facial fill, subtle catchlights, natural pores, lip gloss reflections, individual eyelashes, realistic hand anatomy, and smooth but not plastic tonal transitions. Keep the energy spontaneous, mischievous, adult, and affectionate, like a candid frame between posed photographs. FIDELITY — HIGHEST PRIORITY: preserve the described facial geometry, direct gaze, open smile and light tongue gesture, hand-to-mouth pose, pale-lilac nails, long dark hair, ivory halter details, extreme vertical close crop, blue ocean background, and playful mood. Apply only the stated adult age; do not redesign, beautify, smooth away texture, alter ethnicity, enlarge or suppress curves, or change the expression. Remove logos, watermarks, text, IDs, and QR codes. Photorealistic, non-explicit, secure coverage.