A conformation critique is the evaluation of the bone structure and musculature of the horse. Different horses are built for different purposes, and so, for example, a draft horse with lots of bone and muscle for strength, could not run a race faster than a light thoroughbred racehorse who is built for speed. SO by evaluating your horse's conformation, you will be able to understand what you're horse is capable of excelling in.
Now I'm still getting the hand of conformation critiques but from what I can see, you're horse seems to have good bone. He has long cannons, an upright shoulder, and is slightly toed out on the back. He also looks camped under on the back. He has well defined withers and looks like he's built slightly uphill. He has a long, low-set neck and is lacking weight and muscle, especially on his topline. I don't see why he couldn't do lower level eventing with a little work!
His personality seems ideal for eventing, so who knows! :)