He looks kinda on the chubby side, hehe! :P He's cute. Flat back, looks a little bit uphill (could just be the angle, though) & he could use more muscles. How old is he? What would you be using him for?
He looks good. He is on the heavy side, but that'll just mean more riding time!
His feet look funky though. Not sure what it is about them, maybe that they're not cleaned and he's standing it mud. His right hind looks especially odd.
But that can all change when you see him in person and can closely at it.
He does need some more muscles, but that's nothing that work can't fix.