Mickey Mouse Model Sheet

Does anyone else find drawing Mickey as hard as I do? It seems like if one little line is wrong he ends up looking nothing like Mickey. He's built on simple shapes but I just never seem to really get it right. Oh well, I guess that's what practice is for. Here's a couple of model sheets of Mickey. Check out Mark Mayerson's post that he did back in June for some great Fred Moore models from "The Little Whirlwind". Then check out Hans Perk's animation drafts from the same cartoon.