I've come to realize that I need at least three hours of dedicated painting time per studio session. My process seems to be that during the first two hours, I make a mess. In the last hour, I fix the mess and move forward.
I stopped working on this portrait months ago because I found myself only making a mess, never having that third hour to fix and improve things.
Today I had a good chunk of time in the studio and believe me, I made a mess. But I also made some progress. It is closer than ever to complete.
Scroll down to view several stages of the portrait and the source image.