Wow, he did a number on himself, huh? It looks really good though and not swollen, should heal up in no time. Did the vet leave all those long tails on the stitches that are in the last photo? Or did he/she go back and snip them off closer to the knot? I would think those long tails on there would tickle or possible pull on the stitches and make your horse want to scratch his face on something, which obviously, you DON'T want him to do.
The vet left the tails of the stitches, I asked about them when she was doing it but she said that it wouldn't hurt him to leave them there and it would help us keep track when it came time for us to take them out. She said she normally wouldn't leave them, but in this situation it was better to leave them than to trim them.