Spirits gallop

Ok, I have been having trouble drawing heads, so I thought, why not draw a picture that doesn't show the head? So I remebered the part in Spirit when he raced the eagle, which is my fav scene in the whole film. I loved the bit when the camera went to Spirit's legs when he was galloping and he quickened his pace, and I thought, I would love to draw that! So I took a picture with my digital camera, put it on the computer, printed it off, and drew it. And I absolutely LOVE the outcome, I actually think its my fav drawing I've ever done. I never draw backgrounds but I thought it would look at little empty without one, so I added one, and I'm glad I did! I tried to capture the fact that he was moving fast! And I love the shading, I dont mean to seem like I'm singing my own praises, but I love this picture! The one fault I would say is that the leg thats curled towards his body is to small. Please comment!