I would think there would have to be trademark or copyright issues. It's a Wacky title and he wasn't part of the series.
true. but probably not too surprising.
do a quick search on ebay for sketch cards, and you'll find a bunch of home mades of licensed properties.
like this guy CS3 doing all those Marvel (and Dark Horse) character sketches below.
[expando]http://i55.tinypic.com/5ezerb.jpg[/expando]