first of all much respect to your abilities dude! crits would be - spend some more work on the frontside of the ear. it needs to be well integrated to the head. right now it looks kind of protruding the side of the head (don´t mind my poop english!) also I liked your pure maya version of the geometry more than the zB. why? cause it looked more natural. do more zero level modeling on the maya geo then you´ll need less massive topology changes in zB. zB should be used for subtle greeble stuff and such.

really good work vim!