This looks like it will heal seamlessly within a few days. It looks like the only damage is to the scales. Snake faces are very flexible and withstand a lot of twisting and wounds from feeding. I can't tell from that picture whether there's any swelling or not. All I see is a slightly-lopsided (and adorable) snake face, with a single damaged scale. Especially since there was no blood and the snake ate right after, I don't think this is much cause for concern.
My snakes hit the tubs every once in a while, too. I'm never sure whether to be amused or to feel bad for them!![]()