Laocoon WIP

This is a very challenging exercise, and I'm trying here at all cost not to use the word "difficult", I don't want to work on this piece with my mind set that way.
That been said, I'm going to point out what I am really trying to focus on here, first big shapes, at the first stage of the drawing I looked for the general shapes of the head, then I started to separate light and shadow planes looking for more specific shapes, but always keeping the drawing simple and geometric and not getting distracted by details. That's the stage you are looking at these images below.
The next step of the process will be painting big masses of values. I will post those later on.