Ooo! You figured out how to do the shading! Yay!! I'm glad for you. I still think that make it look better you should add more detail in the fur, add lighting, and shading is still needed in some places. In wolves bodies, like dogs and other animals, you can see where their legs end on their bodies, they don't just disappear, you need to draw that in. And like I said before, they have dots near their noses and thick lines at the ends of theirs mouths. Good luck in touching up your art.