Original lineart can be seen here Colored in Photoshop and Corel Painter.
Aaron's done these collaborations with several different digital artists; usually with people with very different styles than his. It's a brilliant idea and I had a blast working on my end of it. It turned out to be a lot harder than I thought it would be, but I really enjoyed it. It made me step out of my comfort zone a bit, and try new things. And the result, I think, is awesome.
Thanks for working with me, Aaron -- and Im so sorry I left you hanging for so long!