Portrait in black & white (100x65cm), stage 1

This time I've started working on a large black & white portrait (this is stage 1). Usually, I use a regular pencil or graphite when I work in black & white, but this time I want to use black, white and several grey colored pencils to see if I can create a 'softer' effect.
I hope to have it ready before the end of June, because I would like to enter it for the Derwent Art Prize 2013 competition (closing date July 1st), together with the color portrait I drew recently.