Overall, not bad at all. I'd like to see him a bit higher on the box more consistently though. Sometimes it looks really good, other times he's definitely too low. We aim for all four feet above the white every time when practicing, but of course that can take some time to train, and it's definitely more difficult with larger dogs.
Our club is really big on muscle memory, so we use whatever props are necessary to get the foot placement we want so the dog gets used to doing it the right way, and then we start to fade the props. Because your prop is fairly low and maybe a bit far away from the box, there's nothing to prevent him from touching lower on the box, so that's what I'd change.
Our club let me borrow a box and work on it at home with Halo between practices too, and I tweaked the props a lot until I could get at least 3 feet above the white. Here's an example of the props we would use at practice:
There's not a lot of space between the prop and the box for her feet to slip down, but we sometimes will put the barrels (the three pieces duct taped together) on the inside of the regular prop rather than on the outside, depending on what we're trying to accomplish. Here you can see her butt flying way high as she comes in, which is perfect:
And in this run she comes in fairly high, but when she pushes off she's got one of her back feet in the white:
In this one it looks like both back feet are above the white, which is exactly what I'm looking for:
This is one of the prop setups I used on the push board, before we transitioned to the box - she HAS to have all four feet above the white because it's completely covered by the prop, lol!
These were taken at a tournament last year by the husband of one of the women in the club - I was pretty happy with how her box turn looks here:
Again, she's got one back foot in the white, but her rotation is good, she's going to land right in the middle of the lane, and that's with no props so I'd take it any day.
Most of my training videos are from earlier on, with the push board, not the box, but here's a very short clip where I'm working on fading the prop:
There's a clear prop with foam on top in front of the box, no upright on the left, and on the right there's a low upright to support the prop. You can see that even though we have a LOT of props initially, she maintains her turn once we fade them out.