(masterpiece, best quality, ultra-detailed, photorealistic, 8k, RAW photo), underwater photography of a stunningly beautiful young Caucasian woman in her early 20s, completely naked at the bottom of a crystal-clear swimming pool. She has fair, smooth skin and a curvaceous, voluptuous figure. Her long, wet, auburn-red hair floats weightlessly around her head and shoulders. She is looking directly into the camera with wide, dark eyes and a slightly open mouth, conveying a look of surprise or being caught off guard. A single, perfect air bubble is trapped in her left eyebrow. She wears a small, subtle silver nose ring. Her large, full, natural breasts are buoyant in the water, featuring prominent, large, pinkish-brown areolas and hard, erect nipples. She is in a kneeling pose on the sandy pool floor, leaning forward. Her arms are crossed in front of her lower body, but a thick, untrimmed, full bush of reddish-brown pubic hair is explicitly visible. The water is a brilliant turquoise color, and the lighting is diffused from above, casting soft, natural highlights on her wet body. Sharp focus on her face and torso.