I picked up a sketch recently from the artist on eBay, this M.O.D.O.K. vs. Ant-Man done by Matt Stewart. It has the silver Artist Proof stamp on it but is otherwise identical in design to the sketches that could be pulled from packs of Upper Deck's Ant-Man movie card set. This is my second M.O.D.O.K. sketch, which probably doesn't quite qualify me as a super-collector. I do like the character, though, so I have a search set up just in case anything like this pops up at a decent price. I like the colors on this card as well as the multi-exposure shot of Ant-Man increasing his size as he attacks.
He included a business card with the sketch, and that Hulk on the left is an actual sketched headshot of the angry green guy. I thought that was a pretty cool inclusion in the package, although it must be a pain to sketch something on every business card you hand out.
Stewart is an archaeologist as well as an artist, and he did sketch cards for some of the recent dinosaur-themed releases from Upper Deck and Monsterwax. I may get to see some more of his artwork depending on which sketches come out of my Monsterwax Dinosaur Galaxy Kickstarter order. There's a sketch in every box, and I've got two boxes headed my way as well as an extra sketch for Kickstarter backers. One thing that helped me choose Monsterwax over the Upper Deck offering is that there isn't a whole pile of short-printed cards I have to chase.