Portrait assignment/ head drawing

I want to to draw three heads from the below or from earlier heads we've used for reference:

One: a structurally based head, with all the shapes etc, figured out for information.

Two : a rendered head with three controlled  values( black, dark grey, light grey and paper white) focusing on shadow shapes and blocking in darks and reflected light

Three: a head with a focus on a simple line/mark treatment where each mark represents shape form and light using line weight.
Try to use the line to create character and personality of the face.