This one was worked on by both of us, then inked by Sean. We were joking that these two drawings depict what it would have been like if we had known each other when we were kids. I'm the one on the right in both drawings.
This is yet another one that we both worked on, then Sean colored. It always blows me away to see how Sean colors these collaborative pieces. He always uses color combinations that I'd never even think of using. It's beautiful. I'm starting a collection of collabortaive art I've taken part in over on my flickr site. There's only a few pieces there so far, but it's growing!