He looks like he's definitely got some Quarter Horse in him, but again, he may or may not be a cross. I agree that he looks butt high, but the ground he's standing on is definitely not good for conformation pictures. He does have pretty upright pasterns, and is a little long through the back. I agree that you should be more concerned finding a horse that is safe for you personally, and that you would enjoy riding, than a particular breed, or age or type. If he's calm and quiet, and you think he would be a great horse for you, then go for it, but if he's not, you can definitely find something else that does fit the bill. Good luck in your search.