Looks good. Much better than anything I've ever done, although there are a couple of things I can point out.
The eyes need more detail; they look flat.
The snout: the chin could possibly use to extend out a *little* closer to the snout-tip (not much, just a tad), and the top of the snout needs to slope up a bit more from the nose back. It should meet the skull roughly at the mid-line of the eyes, not the bottom.