Some of the big head is camera angle and lens, but maybe if there was more beef behind the head, it wouldn't look so big. The further back you go, the less there is.
My first thought when looking at his topline and withers is, that is a horse. Maybe he'd be okay to ride?
They could be not feeding him well, but I would think if you were going to market him as nice looking, you might want to help him out.