I agree that you should start with the best looking parents, but I had a conversation with a breeder who imports a lot of gravis wc females, and he told me that the best looking babies usually come out of the ugliest snakes. So it's definitely possible to get offspring that blows the parents away. Unless the super cool males in the wild are just attracted to the ugly chicks. A lot of people say that certain morphs get better with every generation, too. That has to tell you something.