Get a photo of him standing like his sire that is not motion blurred or oof.
Side shot. You stand opposite the horse's hip. Front leg nearest the photographer straight. Front leg away from photographer slightly back with space seen to the knees. Back hind leg closest to you straight (can drop a plumb bob from point of buttock to a straight line through the back of the hind cannon to the ground. Back leg away from the photographer slightly forward with space seen between them to the hocks. Head forward at a natural angle not raised or lowered. Ears forward.
It takes 3 people (usually) and patience to get a good conformation photo of a horse. The photographer should also understand conformation and how a horse needs to be set up.
I used to do this photography.
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill
) Dinosaur Horse Trainer