OOoooo~ What's her element? Ink? That be cool! Like if there were ink creatures what splat black ink over everything(kinda like spilling paint over a beautiful picture) or eraser creatures, that would be epic!
You could have her be the typical, seductive, semi-classy, evil female bad guy, but have her represent cliches, which are often a result of art block, so that would fit with the whole idea of them fighting off art block.