Miss C4 and the Batmobile

I'm working on a new poster for the 2009 Central Canada Comic Con (otherwise known as C4). This is the 'guys' poster, one that will go up in auto body shops, gyms, places like that. So, here is the artwork for it, before the logos and such are applied.

The poster references not only Miss C4 (the mascot for the Con) but the fact that the Batmobile will be there.

This is my colouring over my lineart.