I've seen the Original painting for that piece and it's on there so i'm guessing it's just background and shading, nothing more.
I bought a bunch of Original Art from that Artist so when i'm hanging out with him at GenCon, if i remember i'll ask. I almost bought that piece of art, but i chose 4 other pieces first. So Far I own 5 Pieces of Original Art from MAgewars and This Artist.
Depending on how much I spend at GenCon, I might grab that piece as well. I've grown quite fond of the Warlord recently.