There's also the manga, which is pretty far along. All the images so far have just been what Maou wore in the first episode, though, so I guess not as many people read the manga...
(It's much more than just tits... there's a pretty surprising amount of character development in the middle of what is basically the history of the Renaissance in a nutshell.)
I'm somewhat disappointed there hasn't been a picture of asahina mikuru (adult) cosplaying as Maou yet... I was almost certain that Maou revealing her 'mark' was a reference to this.
