Stan Sakai posted a great step-by-step example of a painted cover to an issue of Usagi Yojimbo.
Just thought I'd share with y'all.
I'm looking forward to creating a color cover to my book. I know that's a bit premature, since my book has, what, 7 pages done? But still! Seeing eef's covers and his process, and then Stan's, makes me realize that a hot cover goes a long way towards selling a book. I get sold by covers all the time! That Eric Powell book (Billy the Kid's Old Timey Oddities) completely snookered me based on the cover. The interior stunk, but the point is the cover worked.