I'm so tickled that you're diving into drawing faces too ^____^

I do see what you mean about your sketch of Peter Cushing - you have made him a little "prettier" and younger looking ^___^ But as a sketch on its own terms, it's beautifully done. So accomplished looking.

But, this brings up the thing that intimidate me with faces - to get an iconic face right, the proportions need to be right or they look strange and unnerving. I absolutely appreciate this. But you seem already well on your way with getting to grips with faces - I imagine it will all come with practice.