I really liked the drawing of Tyler Hoechlin. The outlining is really good, and you really have an eye for that.
Now for the horse legs, kind of reminds me where I used to get stuck at a while ago. I started studying bone structure to help me understand where things would go. Make sure the bones are the same length in one leg as they are in the other. Figure out where joints are and understand where all the bones go and how they move rotate in the joints. Another thing is the joints bend in a way that is not round but to the point. I like to draw lines with circles, lines for straight bones and circles to represent a joint. For Example
I once made this picture to show general bones for drawing consideration. Click Here
The hip stays in place while the shoulder blade moves. Good Skeleton reference
Hope that helps a little.