Tohsaka Rin,medium breasts, masterpiece, best quality, anime style, 1girl, solo, black bikini, string bikini, bikini straps, red trim, halterneck, floating, underwater, (upside-down:1.4), (inverted pose:1.3), arms outstretched, spread arms, relaxed pose, slightly arched back, looking at viewer, parted lips, relaxed expression, floating hair, flowing hair, (underwater bubbles:1.3), air bubbles, (water splash:1.2), white foam, blue water, clear water, underwater lighting, light rays, water reflections, full body, vertical composition, dynamic composition, foreshortening, anime coloring, detailed shading