1girl, blue_eyes, blue_hair, blue_skin, blue_theme, breasts, colored_skin, completely_nude, fins, from_behind, full_body, grey_background, grey_skin, looking_at_viewer, looking_back, medium_breasts, monster_girl, multicolored_skin, no_hands, no_toes, nude, original, ruteko_(ruko220), simple_background, smile, soles, solo, white_skin