As mentioned above, it needs a stiffener going across to prevent twisting. You could do that a number of ways. Given what you have built, I would weld a tube underneath going down the middle of the plate so you miss the mount holes, and tie into the side supports.
Another concern of mine is that it appears the recovery ears are attached with a single weld. Those tabs should be heavily beveled, at least 3/8", with multiple welds to refill the bevel. Otherwise you have a 20 ton recovery ear with a 2 ton attachment. This is something I've seen many times, even on prefessionally built bumpers. It would take a good shock load to break it, but if it did, that chunk could do some serious damage. I had just such a failure in my younger years trying to pull the butt end of a douglas fir out of my way. I would accellerate and then push in the clutch to unload the drivetrain just as the slack in the cable came out. That put the dead weight of the truck driving the tree. 6 or 8 blows later the mount welds brokes. I've used that technique many times to move very large objects, but I learned an early lessen in the value of good weld design.
I think the mount looks really nice though. I like the side supports.