You're improving! The lines radiating from the areas of movement in the face are great!

There are some anatomical issues though, the main one being that the face encompasses too much of the head. You've also elongated (stretched) the head a bit. You should also note that the back of the skull doesn't merge into the neck that smoothly; it's more accentuated toward the chin.

I attached a few reference images (by Andrew Loomis) that should be of some avail to you in your head modeling endeavors. I stayed up all night to read J. E. Thompson's series on mathematics, so ironically, the capacity of my mental function is readily declining. Thus, I'll look for more images of relevance later.

Attached Images

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"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram