I came across this:
http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&item=1089189314

of course im not saying its fake or anything, i'm 
just curious, how ever do you tell if a sketch is 
legit though? With cels, its quite easy by color 
and shadow differences, but there seems to be no 
way to tell with a sketch and some times a sketch 
can go for quite a lot of money so i'm always 
worried about bidding or buying any.