1girl, ass, black_hair, blue_one-piece_swimsuit, brown_hair, feet_out_of_frame, from_behind, green_eyes, kantai_collection, looking_at_viewer, looking_back, maru_(marg0613), multicolored_hair, no_eyewear, okinami_(kancolle), one-hour_drawing_challenge, one-piece_swimsuit, school_swimsuit, short_hair, simple_background, solo, standing, swimsuit, white_background