From the angle I will guess his back is long.. not short. He appears back at the knee and appears to toe out in front. His neck and shoulder are typical for the breed. He appears to have a nice low hock with some substance in the hock (often lacking in the breed). From the look of this horse I am unsure if he is cut (gelded). If he is not, from this photo
I would make an appointment with his vet to do so! (That is how important it is to present good photos for a critique).
Better photos are extremely important. This is not a good shot at all.. you need to remember you are taking a 3 dimensional object and putting it on a 2 dimensional medium.
I like his color and dapples.