I like the mouth, but maybe add some more shadows under the chin to make it pop out more.
Also, the stitching over the right eye doesn't look that great, maybe try making them more curved instead of just straight across lines. At the moment 7/10
the teeth look like they bow in instead of out. Cheek bone areas look too low and the angle should be different. make sure the farther back stuff is darker than the up closer stuff. That might help with the shape of the mouth pieces. I'd love to see some brow development. The best part is the closed eye in my opinion. great job with it. pretty good job in general too. <3