Stallion of the Cimarron

OMG I spent forever on this and it STILL sucks. Okay, so I can draw lions, cats, dragons, and rabbits, but not horses. What is it about horses that makes them so difficult to draw?! Please tell me how to draw horses better. Also, if you want to leave a comment saying something along the lines of "it's terrible and you shamed the entire movie by posting this on the internet," feel free to do so. But if you think it's good, feel free to write that, too.
Anyway, happy Easter for everyone who celebrates it!
(BTW This is a pic of Spirit from the movie Spirit - Stallion of the Cimarron, in case you don't know.)
(Also the black blobby thing in the sky is the eagle from the movie.)