I'm well experienced with both Photoshop and Illustrator, having worked for many years as a final retoucher in advertising agencies.
You can see several samples of fun stuff I've done with Photoshop in my profile!
..this is a piece of cake :P
(my bid is so low because I'm new here and need to build up my credibility, and if you're not satisfied, no charge)
I think 2 dollars per image is fair, it really depends on how much work it would be. but from what you described, 2 seems good.