There are skaters, preps, anarchists, teenyboppers, goths, etc. There is a comic for every one of them. Display these books in the window. Your store window has the power to turn creators into rock stars. Have pictures of the creators.
People like to have a face to put with a name.
Put some quotes up as well. List the address of their website. They'll eat it up. Teens love rock stars. Give up on the little kids.