1girl, arms_behind_head, arms_up, bikini, black_hair, breasts, cleavage, cowboy_shot, criss-cross_halter, facing_viewer, halterneck, kantai_collection, large_breasts, long_hair, looking_to_the_side, nagato_(kancolle), official_alternate_costume, one-hour_drawing_challenge, red_eyes, rekka_yamato, sideways_glance, simple_background, solo, swimsuit, white_background, white_bikini