You're on the right path with drawing and practicing every day! So good on that! I recommend that you try to leave your underdrawings and structure lines show the next time that you post something, so I can better critique your work and where you may be able to improve. What I see right now is a lack of structure, especially in the faces of your work, when they are not in profile view. Try and work on that; for example, in the last one, the ears of your wolf is facing one way, whereas the face is facing the other way. The eyes are also flat and not in perspective. And the floor plane of the back stomach is too low, but you would be able to see this with a simple structure drawover, since usually the base of the tail is lined with the base of the belly when an animal is sitting.
Your use of overlap is good, and that's really great because that's usually what most artists struggle with, so I am glad to see you are using reference to try and understand structure without directly copying, but you just need to push yourself a bit further by deconstructing the form.
I recommend works by Joe Weatherly (
http://1.bp.blogspot.com/_ctnBmTVj5x8/TIWpQzcKReI/AAAAAAAAFFk/56iXinvObk8/s1600/Animal+Anatomy.jpg) or David Coleman to help you, or pop on over to the Drawover Paintover thread if you would like me to take a look at one of your works.
Keep at it! Hope to see more soon!