I`ve found that portrait likeness is the hardest part of this exercise.
Since I have no opportunity to set up mirror and lamp in my work-flow in one time, I decided to go wit the window light. I made a little aperture in the curtains to get light come straight from the left side.
So, the MASS LIGHT hits all left side of the face and a little bit of right cheek. And here we get the first trouble - you should know the planes of the face very well. So I have to spent a couple of hours trying to understand this geometrical hell on my face.
MASS SHADOW takes all the right side. And it`s a pleasure, because you don`t need all those detailing in shadow zone. Shadow makes you think about economy.
HALFTONE - well, there is pretty gentle transitions, so I let the soft brush do this work for me
HIGHLIGHTS - they are everywhere! I must be proud, because my hair reflects light so intense =) And I get this pretty rim light on the left border and the tip of the nose.
REFLECTED LIGHT - hair, chin, cheek and clothes. I think reflected light in this picture very subtle because of black clothes and dark wall behind me - light absorbs much more than reflects.
CORE SHADOW - eye corners, nostrils and a gap between lips
CAST SHADOW from nose and surprisingly from eyelashes and eyelids and lower lip.