It looks like the problem is with the face, it looks narrower than the head.
If you look at Kent’s model, the cheek bones are slightly wider, or as wide as the head.
You should be able to use the grab brush and pull the face wider, trying to keep the proportions correct.
It will take some practice and adjustment of the brush size to get right,
so I suggest you save at this point so you can go back and keep trying until it looks right.