A super quick overview of constructing the skull from the side… Of course this is a 3d focused site but these tips will help you visualise the skull and eventually the head in 3d space. And this is, of course, immeasurably helpful for drawing, SCULPTING and painting anything portrait related!
Paid tutorial: https://flippednormals.com/product/skull-anatomy-101-37775?dst=L31x9tYi
Full blog with tips and tricks down below: