It's difficult to tell too much from the picture, but I'll try.
He has a heavy body (from the draft in him), thin neck (from the standardbred), steep croup (draft), maybe upright pasterns, good shoulder angle, and high withers.
He seems, form the picture, to be fine to be taken on trail rides. The jumping will depend on his personality. Even if a horse is built with the best confo for jumping, the horse could simply just refuse to do it. I'm thinking 18" jumps would be perfectly fine. Anything higher would depend on his personality and conformation.
He looks like a cutie!
It's where I learned about working hard
And having a little was just enough