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Hmm.. That's what I've been trying to figure out. For some reason, I keep having trouble keeping it level, so the cannon is always longer than it should be. Maybe that's it...
The back should have a slight curve to it, as seen in this.
Also, just a tip, don't draw hooves facing outward when drawing horses from the front...it's a bad thing for a horse to have and shows bad conformation. (Condition of the horse)