1girl, arms_behind_back, barefoot, blue_one-piece_swimsuit, bow, breast_expansion, breasts, clenched_hands, collarbone, competition_swimsuit, english_text, fins, floating_hair, hair_between_eyes, hair_bow, hand_on_own_head, large_breasts, long_hair, medium_breasts, mermaid, monster_girl, monsterification, one-piece_swimsuit, original, purple_hair, red_bow, rikeza, scales, smile, soles, speech_bubble, swimsuit, transformation, underwater, very_long_hair, yellow_eyes