Here I find something unkosher: the geometry works against the contour, leaving on point to define a curved jaw bone.

Select the culprits...

... and spin them!

This leaves one of the newly spinned polys conveniently aligned with a neighbor.
Select those two and merge them into one poly [Shft-Z].

Both steps in perspective:

I select two polys as future ears and delete them, then bandsaw the face polys for a better division between mouth and nose.

Tweak. Select mouth.

Smooth Shift.

And tweak again.
(Like we did last summer.)