Is that second weapon supposed to be a shotgun? Looks a bit strange the way it comes to a point like that.
The chainsaw is my favorite, but I think the hilight on the red area could be moved up a bit or something. I dunno, it's a bit pillowshadedy as is.
The dark line between the shirt and head on the back of the zombie is...a bit distracting.
Otherwise the zombie's cool.