Can you see who it is yet?

Went to my Art class where today we were learning how to do portraits in acrylic using palette knive and brush.
We did some small pencil sketches at first, so what with that and some demonstrations we only had about 30 mins to work on the largere colour portrait. Although it still needs quite a bit more work done on it, I was quite pleased with it.
It's of a pretty famous person taken from a small black and white photograph. Wonder if anyone will recognise him?