As for critique, the wings, here are some simple (and hopefully helpful tutorials) http://real4fantasy.deviantart.com/art/WING-tutorial-22535106, http://thy-darkest-hour.deviantart.com/art/Wing-Tutorial-304198167, http://theantimonyelement.deviantart.com/art/Bird-Wing-Tutorial-150844565, http://ciameth.deviantart.com/art/Ciameth-s-Wing-Tutorial-259586003.

Now as for the wolf itself, the head is slightly off, heres another tutorial on that: http://grinch-gal.deviantart.com/art/Tutorial-How-To-Paint-A-Wolf-165698655?q=favby%3Agrinch-gal%2F46870939&qo=25, I think, from my point of view, the head should have a more geometrical shape, since they are longer and wider than domestic dogs. Thats more or less how I learned to start drawing/sketching them anyways. The hind legs seem kinda off to me, so here's some sketches for those: http://christ1nme.deviantart.com/art/Dog-Leg-Study-86051129, http://krazyklaws.deviantart.com/art/Wolf-hind-leg-structure-15923166. The wolf's rear is slightly more rounded, not so blocky. Here's some overall tutorials to help you improve the general anatomy: http://autlaw.deviantart.com/art/Wolf-Anatomy-Part-1-330363684 & http://browse.deviantart.com/art/Wolf-Anatomy-Part-2-330536249

Remember, practice does make perfect, and your on a good track!