Hopefully convinced you that in order to understand the planes of the head we need to first understand the skull then the muscles.
Here's a front view of the skull with the bones labelled:
Note: the best way to distinguish yourself from other artists is to have a solid command of artistic anatomy (a goal I'm still working towards!) To that end, investing in a replica skeleton (the skull of mine is in the photo above) would greatly contribute to your learning. You can't touch nor examine closely a photo or illustration especially since most from the internet are low resolution. This is the skeleton I bought in 1997 for $349 from Evolution in New York City (notice that it's now $269; I paid $80 more and had to physically drag it home on the commuter train!) Despite not using the skeleton as consistently as I should have all these years, I guarantee that studying anatomy is infinitely easier by having a model to look and touch. See the bones in 3D makes them easier to understand and communicate on a 2D surface.
Back to the skull: as you do daily drawings of the front of the skull, memorize the names and locations of the individual bones. We'll start to build on that knowledge in the next post: muscles of the brow and forehead.
Would this post have been better in some way? Do you feel you're learning anything? Post a comment!
Until next time, happy drawing/studying!