1girl, arm_strap, ass, back, backless_swimsuit, bare_arms, bare_shoulders, black_swimsuit, blue_hair, breasts, closed_mouth, from_behind, hair_ornament, hairband, looking_at_viewer, looking_back, medium_breasts, medium_hair, nature, one-piece_swimsuit, outdoors, shoulder_blades, solo, standing, swimsuit, thigh_strap, wading, water