hello everyone I'm practicing skull, I'd love to receive critique and advice.

Critique please

Critique me please

hello everyone, I'm practicing the gesture and I wanted to ask for some advice and criticism to improve

Hello everyone, I'm practicing head drawing, structure anatomy etc. I am studying from a Glenn vilippu course, new masters academy, I found it very useful and I think that I am learning the basic concepts of structure and plans, but I have noticed some difficulties in capturing the likeness, I would like to get some advice under this appearance (and in general).  furthermore, if you can recommend sources that could strengthen my knowledge, I would be very pleased.  Thanks everyone for the advice.

Hi guys this is some head drawing from some master. Please critique me

Ho guys, this is some anatomy and structure head drawing, please critique me.