I did a little research today (several hours actually) on various portrait artists' work, looking at different palettes, Zorn, Henshey, Robert Liberace. I'm impressed by the Liberace demo here Liberace demo. This video is the third part which is near the finish line of the work. I like the way he talks about the colors he's using as he goes along.
This is not on the video but an example of his work.
So this is the study for that painting I told you about of my husband. (kidding)