I also liked the sketchy version. "You can almost feel his pain" no longer applies to the newer ones. The mouth is what I liked most, because it was open in a fashion more befitting of the term OMG. If you're going for realism, then you might wanna consider a complete redesign, cause none of these have anything close to what I would call realism. The eyes are extremely pilow-shaded, and have some odd-looking and inconsistent angles...um, they're not round.
Can you be a half Zombie? I thought you were either alive and therefore 'NOT' a Zombie or dead and 'A' Zombie?
Well, there are quite a few zombie virii out there. I wouldn't be surprised if there was one that completed the zombification process before the host being was biologically dead. Quite a painful experience, I imagine.