Honest opinion?? I think it looks pretty good, face done correctly, and the eyes and tear ducts are in good proportion. I am not a real fan of their ears turned out that way, but that's just me. Go look at various live mule deer images, and 90% of them will be cupped forward a little more. With high horns like yours, the buck probably carried them a little higher, you can raise them up a little more but still turn them a little more forward. If the clay is still a little bit malleable, they could still be moved slightly.
I'd like to be standing directly in front of it, to see if it is straight on the wall. It makes it look like the brisket hair and work on the left side is a little lower than the right side. If it is square on the form and on the wall, then that's just the way it grew. Alll in all, I still like it, and would be proud to have it in my home!!