Generally things look in-place, but it's still not tight enough. You have some problems in the forehead area, the cheekbones and the back of the jaw which should go a bit further back. The shape of the skull could use a bit more tweaking.
Basically you were given a great advice. Grab some reference and study from it. I'd use a skull at an early stage, and try to study the proportions and shapes. Then move to a bit of a gaunt face/head, and try to sculpt that, looking for the landmarks you remember from the skull sculpt. Then move to a more meaty face, and finally to saggy, fatty faces in which the anatomy is hardest to make out under all the loose skin.
That's what I would do to study face sculpting. Well that's what I did, and still do.
Quite happy with my results so far.