I can help design your book jacket if you'd like. I have experience in graphic design as well as layout. Here is my gallery focusing on layout and graphic design: [link] I think you'll find the program design would be most beneficial. Please shoot me a note if you are interested in my style!
I work well in Photoshop, Illustrator and InDesign. Full text, crop, bleed and adjustments for $75, with your already completed jacket painting included (I'll need the full-resolution file to complete it--did your artist give you a release?). Do you have specs on the size of your book cover (i.e. largest dimension, bleed required, etc) from your publisher?