Guess Who

I finally got to start a new project. I've been wanting to draw a huge portrait for a long time and now it's finally here!!! It's a 3mm thick 140x100cm piece of drawing cardboard and I love it! 
I would like to make this a guessing game. Who can identify the person in my drawing? 

I will be updating this WIP as I go along. It's gonna be a long journey, I can already tell...