commenting to rate.
This strikes me as a very good model by its unanimated look.
As I tried to tweak animations before I think I can be trusted when I say the following. The job that was done here with the zombie is, imho, very well done.
5/5 for me.
I would like to address some criticism i read in the comments in this regard.
A small reply to Misha
First, I had to focus to see this defect due to how small that is. Also, to my understanding, it only affects the walk sequence.
Second, I question the relevancy of this. My opinion is that it is utterly irrelevant for all the common uses of this model.
Third. It sure can be corrected but the minuscule impact of an improvement wouldn't be worth the effort, always imho.