The first horse, while having his LS in the right place, is a bit long backed over all. The second horse may be correct, but with a ssaddle on, it is hard to tell, His neck appears to have a somewhat low set and that is not so good for jumping.
The third horse has a long back and his LS is placed too far back. He also has a low neck set even though his head is raised high for this photo. His gaskins are a bit long and his hind leg is over angulated. He lacks bone and is long in the pasterns.
The last horse has the strongest BACK and COUPLING of the all though his LS is the furthest back in this group of photos. He has a nice hind leg but appears a bit pigeon breasted and may have a low angle to his humorus and insufficient shoulder to get his knees up over fences. He is worth a look as are #1 and #2.
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill
) Dinosaur Horse Trainer