Quick sketches of face showing different angles of face and head.
Shape of head:
I have a very angular face, a defined jawline and cheekbones
Here I have determined that my jaw has three defined planes or angles from the top of my cheekbone to the base of my chin. In the second image I have added my cheekbones and hairline. The third image shows that looking at my face straight on, the visible part of the top of my neck begins from 2nd (or middle) angle of my jawline.
Looking at my neck front on, the lines which run from the bottom of each cheek bone down to my chin (either side of my mouth) line up with the 'v' shaped line in the centre front of my neck.