Of the first group of horses I would like to see #2 without a saddle. This 5 year old may be a bit long in the back and rough coupled, but you cannot tell for sure. Nice low hocks and knees.. though a bit light in bone. This chestnut horse will not do very well over big fences but might be OK for the 2'6" hunter or equitation rings.
The third horse in the first group looks good in this photo and I like Bay's but I think the horse is a bit restricted in the shoulder so may not be flashy in extensions. A photo of this horse set up correctly for a photo would be very much better for judging for dressage prospect.
The first horse (also the last horse) in the first group is long and weak backed, tied in behind the knee and back at the knees as well as too straight behind. A shorter back and better front legs and this 4 year old could be a jumper as he has the correct shoulder.
In the second group, the first two photos (same horse) show a horse that has started training but is going to be very difficult to balance in Dressage as he is very butt high and long backed. He has hocks that are a bit too high and his hocks look capped and I wonder if he has bad stall manners (kicks the walls and has capped his hocks).
The photo of the pinto tells you nothing. The horse is jumping but the exposure is so dark you cannot tell if the horse is REALLY that long and hollow backed over the fence or if the horse's color creates and optical illusion.
Of all these horses, the most useful looking is the chestnut with the western saddle.. unless that horse has the long back and rough coupling I suspect is there when the tack is off.
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill
) Dinosaur Horse Trainer