Very gruesome. I like the second to last one the most because it really looks like a mask. I've got a... thing for masks and generate a lot of them in Midjourney.
It's always difficult to get something that actually covers the entire face and is completely featureless.
Yes some of these definitely aren't masks but I was surprised that a lot of them were at least, or at least you see the eye's slits clearly. But yeah it's a super fun rabbit hole to dig in, because masks are smack in the middle of "uncanny valley makes the subject better <-> worst" so a lot of the time all the imperfections or nonsense of AI imagery just makes them work even better as masks.