First off, I like the design alot! Now as far as my crits go, I cant call them mistakes, but Ill tell you the parts that arent to my taste:
The top of the cheek under the eye comes to a sharp ridge. I think it would look better a little smoother (just a little).
The junction of the head and the top of the ears is a little strange. I would either cut more of a slice between the ears and head, or if you like the way they join, then I would bring the top of the ears closer to the head a bit.
I would pronounce the mandibular jaw bone and muscle a little more.
As far as the rest of it is concerned, I really dig it
I look forward to seeing this evolve.
D