I'm still learning about conformation, but I see an upright shoulder, upright pasterns and possibly slight sickle hocks? I'm wondering about his neck set too, though I don't know enough to really critique it properly.
Other than that, I think he's pretty darn handsome! Congratulations. :)
I wouldn't say he's sickle hocked exactly. His back legs don't slope under him when he's lined up...
He's cute!! He looks athletic but also sturdy in my opinion. His proportions match nicely - everything from the neck, to midsection, to hind end all "match." His withers are reeaally high, so be wary of that when fitting a saddle. He does have a steep shoulder, which will make it difficult for him to really lengthening his step in front. I noticed that the length of his topline seems to be a little long compared to his underline - usually you want it to be a good bit shorter, like this horse:
He's got a good long croup with a nice slope to it. His gaskin looks a little long, and looks a tiny bit camped out behind with slight sickle hocks. Definitely not major though. His coat is very shiny too by the way! He's a nice looking horse.
He does loook very nice working english (in my opinion). :) Here is a pic of him on the bit.
From this picture alone, I can say that he's not actually on the bit, that's his front end held back with no push from behind. No push=no impulsion or collection.
I do how ever like the looks of him alot.