I don't like that Scarecrow design...remove the gas mask filters (or at least hide them in a way that fits with the theme), and the needles, and it'd work OK, but, as it stands, it doesn't.
Ivy has some good ideas (I really like the 'organic tattoo'), but the 'bikini bottom' design and the uniform top just don't work for me - either going all the way with 'artfully concealed nudity' (though that might be hard to make work in a game), or going with a more comic-typical look would be better.