1girl, akizuki_(kancolle), ass, beach, bikini, black_bikini, black_hair, black_headband, blue_sky, calin, cloud, cowboy_shot, day, from_behind, grey_eyes, headband, kantai_collection, long_hair, looking_at_viewer, looking_back, one-hour_drawing_challenge, outdoors, ponytail, side-tie_bikini_bottom, signature, sky, solo, swimsuit