1girl, back, black_choker, black_hair, blush, breasts, brown_eyes, choker, dress, from_side, hands_on_own_head, happy_birthday, hiiragi_shino, idolmaster, idolmaster_cinderella_girls, idolmaster_cinderella_girls_starlight_stage, large_breasts, long_hair, looking_at_viewer, parted_lips, popon_ta, sideboob, simple_background, sleeveless, sleeveless_dress, smile, solo, white_background