Wow, this is awesome. The shear change in size is frightening, since if you saw a wolf that big you would run for the hills. Also, I do like how I can see the human form features in the wolf form, giving them some connection. Great work.
Verrrry nice! ... with a slight kibble. Her head seems a bit small in proportion to her body. Having said that, I also note that such things have been used to effect with characters such as Kingpin, from Marvel Comics.