
Can I just first say that I can't even tell you how happy I am to see the shape of the wings that you've given the wolf? So many times I see people draw wolves with sail wings, and they cut into the sail way under the arm of the wing, and just nfgn;dlhgmdfh-- so MAJOR love for the large wing sails, keep the good work up! e u e
And for critique on the wings, I'd have minimal notes. Beef up the limbs some, maybe make the wing bigger to hold his body up, and-- this is really just a suggestion that makes wings easier to draw, I personally think, so feel free to follow it or not-- but if you make a little "hand" where all of the digits of the wing connect, it REALLY helps to flesh things out easily. It just allows you to get a really nice idea of where the digits connect, and solves the issues of clutter. Some people may not like how it looks visually on the wing though, so feel free to completely disregard this note.
For the pose, the first thing I'd suggest is raising up the wolf's angle a bit more. This isn't necessary, because you could always be drawing them dropping from a rear, but it can create more of a dynamic image if the subject's raised, especially given the flare of the wings and the intense expression that your wolf has.
I believe that it's necessary for the one leg to be forward in this pose to keep the wolf balanced. Perhaps angle it a bit back, rather than forward, to show that it's taking some weight, but otherwise don't change a thing, it's a good decision.
I couldn't get the other hind leg correct for the life of me right now, and didn't feel up for having a really awkward, club-foot looking leg, so sorry for the lack of it in this redline. x'D -- I'd just say move it back a tad bit, and lower it on the ground to suggest more depth in the wolf's stance. Raising the tail up to the backbone will also help with the haunches.
I think that I may have overdone the curves in the neck in my redline, but just wanted to show how adding more fur can help to create that canine chest, especially a roll over the shoulder.
For the forelimbs, I'd say it's just a matter of making them more fluid, and the joints more rounded. I think that you have them in good locations for the pose, since they match the rearing position well. :3
Edit: I keep forgetting to include the redlines when I post, FTT. Fixed.