His Topline is pretty badly roached when he's free standing, what's his mouth like because he looks a bit pouty which can be a sign that he hasn't got a very good mouth. I agree with Louise that he looks quite long in the back, if anything they normally look leggy at this age.
His stifles look quite straight in the stacked pictures of him too unfortunately.
He has a lovely neck, head should mature but for a breeder to get two show prospects out a litter and handsome pet that's typey but not show quality is good.
My boy is the same age. He looks horrific ATM so they are at that gangly age. I am very particular about what pictures I post of him because of prying eyes