Detailed Anatomical Pose Description for Bikini Portrait

An extremely detailed, structured JSON prompt for Gemini Nano Banana Pro focusing on the precise pose geometry, apparel, and lighting for a medium shot portrait of a young adult female in a black bikini. The prompt meticulously describes hair, accessories, makeup, and, most notably, the complex pose, including head rotation, arm angles, spinal curvature (lumbar lordosis), pelvic tilt, and weight distribution, aiming for a highly realistic and specific body posture under hard sunlight.