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Hi Justin,
You can use burnt umber to sketch the features for the face.
It shines under the painting and harmonizes other colours.
It may crack after years if you put it heavily.
In my son's portrait I left on the surface the pastel I put first.( you can see it on the neck.)
Anyway I don't paint in oil as well as Pino does. I hope to learn in the future. By now I use the pastel as underpainting because it helps me to get the deepness whithout waiting till the oil is dried.
Ciao
Adriano
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