I hadn't heard of Jeff Slemons before, but he's apparently the one responsible for the Spaceknights piece you're seeing to the right. This piece of art, an ink illustration on 15" x 20" Strathmore 4-ply Plate Bristol, is currently up for auction on eBay. Don't consider this an endorsement of the seller, as I don't even know them, but it's at least worth looking at while the image is available.
UPDATE, 4:00 PM: I stand corrected. I have heard about Mr. Slemons before at David H.'s blog, but had forgotten. Still generally unfamiliar with him, though.