Some renderings visualize nature spirits as being more malevolent and crass.
This somewhat disturbing image, dripping with sexual innuendo, was a commissioned illustration by Kinuko Craft, for an adult version of Goblin Market, so don't blame her for its content. But it's a lovely execution in the old fairy tale style.
This image is a small print in my pictorial morgue, but it was originally an illustration for Playboy in 1973.