Great job on the craftsmanship here; the fur and nose and eyes are excellently done. Pat on the back for that.
Next time, though, really really check your initial sketch before you go into the details. There are some errors on the head that could have been easily solved by checking the sketch (or painting in its early stages) in a mirror.
If you flip the head around, you'll realize that the left ear is far lower than the right. and that there's too much far side of the face showing for the angle you have the muzzle at. It's stuff that just takes practice and patience with the intial sketch, not something that's easily corrected by this end.
However, you've done such a great job with little details like the fur, I'm sure that now you know these new techniques, you'll use 'em really well. Keep up the great work! It's a lovely piece.
The wolf is beautiful, but so is the rest of the image. The fur is incredibly detailed and breath taking.