These are drawings made in class (tutor Jake Spicer) and after, looking at the whole head, not just the face, and with different tilts.
And here are some additional exercises made from people on Instagram.
Classwork – head tilts
kestrelart
Welcome to my online sketchbook
kestrelart 
You are producing some really good stuff
Thanks. It’s good to put time into the technicalities. Being on a course imposes a bit of discipline into my drawing.
Yes and always good to top up on some informed advice. You’ve made me smile mentioning discipline. I always think of you as trying to come up with another way than the one you are presented with!
Wonderful drawings – all that work is paying off!
Fascinating! Thanks (again) for involving us in your process!
good sketch