These aren't the best pics to be able to answer your question accurately but from what I can see....based on the first pic his topline is arced. Could just be the way he was standing. But toplines (from neck to tail) should be level w/no bumps, dips, etc....just a level FLAT line. His tail set looks a little low too...but again could be the way he was standing.
You'll want to get a photo of him free stacking himself on a hard surface....it's really difficult to say for sure based on those pics. And I don't dare to say too much just because it's hard to see him well enough. He is handsome
...but there really is a lot to the standard. More than you'd think! LOL How is his bite? Does he have both testicles?