He just looks super ticked off by your hands. I know this is a show, but I don't see any form of give and release. Both of you are simply bracing against each other, hoping the other one will give up first. The horse is not moving out, nor is he even collecting. You have to get some more feel with your hands first, and work on not getting into a tug-of-war match. Reward every little try, even the smallest of dips. Release fully. I know in the show ring you have to have contact, but at home you are allowed to give him more space to breathe.
Personally, I think he needs to learn a great deal of lateral flexing. I'm a pleasure trainer, so my horses have to hold their headset and collection without touching the reins. However, I get them so soft and supple through flexing and collecting that if I decide I want to hold the reins with contact, they carry on and do it. If they have a problem with full contact, I either put them in a circle and lift up the inside, I'll back them up until their head is down, or I'll flex them side to side through a particular gait until they get happy with a straight head.