The mouth. After doing the eyes, the ears and the nose, the mouth of course couldn’t stay behind. I think its interesting how many lines the mouth does not actually have. The outer contour is more hinted at than drawn, except for the shadowy corners and bottom part.
And a bit of bonus content
As I had most of a face ready, I thought to combine the bits I had and make a “semi face”. Yes, it lacks a lot, like the little ridges between the nose and mouth, but its still the best face I’ve ever drawn. Even if it wasn’t in one bit.