1girl, arms_behind_head, ass_visible_through_thighs, black_neckerchief, blonde_hair, blue_eyes, blue_one-piece_swimsuit, blue_sailor_collar, crop_top, flower, grey_background, hair_flower, hair_ornament, kantai_collection, long_hair, maru_(marg0613), neckerchief, one-hour_drawing_challenge, one-piece_swimsuit, one-piece_tan, open_mouth, ro-500_(kancolle), sailor_collar, school_swimsuit, school_uniform, simple_background, sleeveless, solo, swimsuit, swimsuit_under_clothes, tan, tanlines