/ic/ - Artwork/Critique

Does this look like a good way to practice? Am I doing anything wrong? I'll appreciate any feedback, tips or advice. I'm trying to get better at head drawing, worked through Huston's beginner course but it still feels like I mostly draw from observation and don't really understand form or planes, I got to the jaw chapter on Bucci's course last month and intend to finish it now, hoping that will help me with understanding planes.