1girl, armpits, arms_behind_head, arms_up, bikini, blue_eyes, blue_hair, blurry, blurry_background, breasts, cleavage, collarbone, ganaha_hibiki, hair_ribbon, happy_birthday, hood, hoodie, idolmaster, idolmaster_(classic), idolmaster_million_live!, long_hair, looking_at_viewer, medium_breasts, milliani, navel, open_clothes, open_mouth, outdoors, ponytail, ribbon, sidelocks, sky, sweat, swimsuit, wet