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: SKULL ANATOMY 101 - FlippedNormals
Full blog with tips and tricks down below:
Not sure on the category here so feel free to change or let me know so i can change it (MODS)