Portrait Studies

I was becoming frustrated when working on some characters when it came to working on their faces. I decided at some point last month I'd spend most of the time focusing on studying the planes, and doing portrait studies. This isn't all of them, but I figured I'd post some of the ones I like a lot. I hope to keep doing regular practices, but I think it's almost time I get back into some projects. I have some fan pieces in the work and world building stuff. :) Can you recognize any of these actors? God, I hope so lol.