I think I'm really starting to get it... Though I'm still getting a bit tripped up by the more extreme angles.

I always feel like I understand as I'm following along with the classes, but once it comes to the assignments I struggle, particularly with the underside of the jaw planes and head tilts that are toward or away from the viewer. Once I start going through my assignment work for upload I tend to feel like a lot of it is off, from the neckline to tilt to brow.

I think I'm starting to get it and understand how to use the ellipse but it still looks off and I'm not sure that I'm getting it.

I think I'm getting confused about the axis line you use to determine the angle of the the cranial mass. In most of your examples so far, you've placed it at the relative center of the sphere, but in the 3rd example here you have it much more off center toward the front of the face. Does the placement of this guide matter, should it be aligned with a particular part of the head? In other examples it seems to align with the ear and back of the jaw but here it seems to align more with the edge of the chin.