Both of these horses are going through a fairly "weedy" age. Hopefully that will improve with age, better feed and maturity.
This horse is an example of why you don't breed two very dissimilar types of horses (Draft/Thoroughbred cross) w/o really making very sure the conformation of both is superb. While this is a nice fellow and a pretty color, he is a bit over at the knee and is developing the steep croup and long back with a hollow coupling typical of so many draft horses. He has a nicely laid back shoulder but the bone from point of shoulder to elbow lays rather shallow and he won't be a jumper. This angle is likely from his draft horse side. He is a bit tied in behind the knee as well. He seems to have inherited a nice slope to his pasterns from his Thoroughbred side and his head is more Thoroughbred than Percheron (but he sure has Percheron ears!). He is also quite rump high which, if he does not grow out of it, will impede balancing him when riding him. His necks is set properly tho it seems a bit short. Give him a couple of years and lets see him again.
This is a better horse though he is really very weedy in this picture. Part of that is his age and part may be due to eating a lot of poor quality hay last winter (and it may be worms.. but I suspect it is more attributable to poor quality hay). When a horse gets poor quality hay as their most prevalent food source, they will eat and eat.. and not get a lot out of it. The result is a horse that looks like this one.
He neck is set a bit low and is a bit ewed, but may improve with age. He has a nice short back and a strong coupling.. nice croup.. but this can change and usually not for the better. At this age it is very hard to tell. His legs are very thoroughbred.. but be careful of those somewhat puffy looking ankles.. I would be a bit concerned about epiphysitis. He looks to have nice, roomy hocks and that is always good.
I can hardly see his feet, but the near front that I can see appears to have a very shallow angle to it. Keep his feet trimmed properly with adequate heel depth. As with Ghost feed him good quality feed and let him grow. Lets see them both again in September.. or even next spring!