Patricia,
From seeing your portrait from the workshop, I can see that this palette is really working for you.
I will not be able to afford Marvin's workshop for the foreseeable future. (But I can't wait to get his book!)
I have to, for now, rely on the info I get from this forum. It is harder to absorb just by reading and seeing photos than it probably would be in a workshop doing hands-on. I persevere and I am putting Marvin's palette into practice on a portrait I'm working on right now.
We'll see how it turns out. One part reading, one part looking at results in Marvin's and other's work, one part conjecture and one part hubris.