I don't know much about drawing wolves, so I may be wrong on this, but I think the lips should be pulled back just a little more. If you know what I mean. x3 Also, I'm been reading this really awesome North American Wildlife drawing book I got for Christmas, and it talks about 'ear pockets' on wolves, big cats, and some other animals. It's a little detail, but makes a difference.
Example - You can see it on this guy's left ear. :3 Of course, you can't see it from all angles, but it's good to know about x3 Wonderful drawing, and very nice texture throughout.
