Book cover artwork

I am publishing my second book and need some custom artwork for the cover. It is a modern humor/ fantasy novel called Endtyme, and my idea is to have it done in a "woodblock" style (samples included) but modernized. It is about the end of the world, and the main character is a chubby, sloppy man who drunks too much. Sort of a combination of Nostradamus and Al Bundy. So I thought doing an old school woodblock print but with modern details (beer bottles, sweat pants, etc) would be funny. I have some specific file requirements. The size of the book is 6x9, so the file should be at least 300dpi, but the bigger the better. Should be sent as a jpeg and pdf.