I don't see anything that should stop him from being able to jump! He looks pretty well balanced for a three year old - and that's often not the most attractive stage for a young horse.
His legs look clean and sufficiently straight - there might be a little too much angle to his hocks and he toes out slightly in front, but I had a fantastic Adult hunter who toed out much more obviously and it never adversely effected her, she was and is a very successful show horse. She did need to school in boots though. I think his shoulder is sufficiently laid back and has a nice open angle. His croup is less sloped than his sire's, which I prefer in a jumper. His neck ties in a little lower than ideal, but overall, I think he's an attractive young horse.
I suspect he has pretty nice hunter movement. You can set up a jumping chute to free jump him if you want to assess his style over fences. It can be beneficial for young horses to become accustomed to jumping without a rider, anyway. If you have any questions about anything I posted here, please feel free to ask! Good luck with your horse!