This is a bit of a tough issue to tackle, but it looks like you're doing this digitally, so I think I can lend a hand. XD
I agree with everyone else here. You're lacking shade and light, but after that, you can be pretty much well on your way.
It helps to have lineart or at least a sketch on hand.

Try creating a new layer for the shading and putting it over the wolf. Colour that entire layer the darkest colour of your shading. Lighten your colour a bit, now colour on every single bit of the wolf's body that touches the light.
A bit lighter, paint some more, now in the spots that touch more light. Keep going until you hit the brightest colour you need. Those'll be your highlights.
When you're done, set the layer to overlay or soft light, and you're pretty much done. Thanks for reading, heh.
(Okay I'm the *worst* explainer in the world. I've got a thing with images to explain...

)
https://scratch.mit.edu/projects/74041002/ (There. Hope this explains better, XD)