I would like to see the dens canines. These are sharp teeth at the 3rd rows from the middle in both the left and right, and up and down.
Also the blood on his shirt is a bit weird as there is no dripping, and the chin is clean, maybe a bit of blood dripping from the mouth or ears or eyes.
And I would love to see a comic made from these art pictures. Maybe a comic without dialogue, just with a lot of non-verbal communication. You're very good at representing them in your art.

Protip: This is what Slenderman would look like, if his faceless face broke open.