1girl, o, ass, bare_arms, bare_shoulders, blue_one-piece_swimsuit, brown_hair, from_behind, green_eyes, grey_background, hands_up, long_hair, looking_at_viewer, looking_back, low_twintails, one-piece_swimsuit, original, parted_lips, school_swimsuit, shibacha, simple_background, solo, swimsuit, twintails