Thanks Lukies! I definitely start with a sketch, I didn't realize I hadn't copied over that part on my process. I use the sketch to help define my planes of the head like this.
I drop the opacity way down and then start to do the blending with it still on. I disable the sketch layer once I have the shapes rendered in a way that I dont need the sketch anymore. This is how I have been doing it, I don't know if this is a good process yet. I am trying to find the right worklow for portraits so take it with a grain of salt