It's Knuckles and Dr. Finitiveus (spelling?) from one of the Sonic Universe comic covers. However, I drew them too far apart, and couldn't have them shaking hands, because then their arms would be abnormally long, so I had to emprovise...
Otherwise, I think it looks pretty good!
Knuckles and Finitiveus belong to Sega and the Archie Comic crew, not me.
not for free use!