This is a tremendous demonstration for those of us who are beginning in portraiture and need practical instruction. I do not mind the idea of tracing at all if that gets all the pieces parts in the right places. I have found the grid method works well for me, but, regardless, there is real art in not loosing the likeness during the actual painting. I find your suggestions on photo alteration to pick out subtle coloration and to define the tonal range to be extremely helpful tools. This demo is quite well written with clear concise information and relevant illustration of the techniques used. Thank you from one who needs the knowledge.
"To Begin, Begin." - Wadsworth