On the copyright issue. An artist owns all rights to an original image/design that he/she creates. These said rights can only be transferred to another person/user through a contract(for free, or by selling it to them). For example, I can sell my models/art to other people in a few ways. I can sell all the rights to said peice, it is then no longer mine(but will cost the most, as they could then turn around and sell the art/models themselves). Or I can sell usage rights, while still keeping the copyright/property rights.Unless Fred Gambino gave explicit written permission to use his design, he could sue for it(but it would be a huge time waste, as I doubt you've made alot of money off of your product, to make suing for damages worth it).

I eat babies.