Wolf anatomy study

Wolf study/preparative work for an upcoming pro illustration
I never studied wolf before, so here is the work of the day

I used the tutorials bellow (about 2h30):

http://www.deviantart.com/art/Anatomy-of-a-Wolf-A-Tutorial-110298195
http://autlaw.deviantart.com/art/Wolf-Anatomy-Part-2-330536249
http://autlaw.deviantart.com/art/Wolf-Anatomy-Part-3-332335233

The photo study (about 1h):

http://www.deviantart.com/art/Wolf-kids-172962026