The first one is too far away and the second one the horse is in the shadows.
As far as the last picture - it looks like he's got a low set tail. Maybe sickle hocked but could be just his stance in that picture - other better pictures would help (refer to the website I mentioned). He's got a nice neck. Nice back and barrel. Something looks off in the front legs, but again, would like to see better pictures (also from the front).
Multiple pics are really beneficial, especially if the horse is just in an awkward position.
Unless it weighs a ton... it's just a horse. Draft horse motto.