Thanks for the feedback, guys! And for the edit, Decroded!
The saddle is supposed to be a
Mongolian saddle, which is quite high, although my sketch of it is very odd-looking at the moment. I'll work with it some more once I get around to detailing the saddle, and if it still looks weird, I'll lower it. Good point about the tail.
Pikminboy, the light was supposed to be coming from the upper right. I'll probably lengthen the shadow more after the horse, but it's still rough for the moment. The horse is also not done. It has hooves; they're just not detailed yet.