Jumping wise, he looks like a sturdy little guy. His front legs look very solid, and his behind is a little small, but looks powerful. He's got a nice slight uphill build, and if you get him working off of his hind-end, this will benefit him for jumping.
I did notice that he looks a little camped under, and that his neck is a little thick, but it shouldn't affect him too much.
I like him =] And everyone is right, he is very fancy for a mustang!