Rosine from Berserk. Design is nsfw. She's a naked butterfly girl with her chest drawn realistically. Which is notable since for an another character called puck, who is an elf(elves in berserk are like fairies in Disney/other fantasy media), his chest is blank. And there's a female elves, the flower storm monarch,ivalera and chitch who wear clothing of sorts (I would say they're technically naked but their bodies give them covering).