1girl, d, armpits, arms_up, breasts, bubble, grey_hair, hair_ornament, idolmaster, idolmaster_cinderella_girls, kanzaki_ranko, kirisaki_byakko, kneeless_mermaid, large_breasts, mermaid, monster_girl, monsterification, open_mouth, pink_eyes, shell, shell_bikini, smile, solo, twintails