Here are some pictures of my progress with the skull. It looks OK so far, but still has a long way to go.

A front view and side view.

I am still adding tweaks to the eye sockets, before adding the eyes. I have some wooden balls I got from the craft store which will be the eyes.
Then the nose needs some serious reshaping.
I roughed in, marked painted the indentations.
The size and dimensions are based on the paper craft T800 endo model.