I better post something before Droosan gets way ahead of me again!
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This is a quick experiment I did during lunch today. A friend told me about a color technique where the human face can be broken down into three color zones: (from top to bottom) yellow, red, and blue. This has to do with the visibility of blood vessels under the skin. I applied these colors after painting the face as a very thin glaze, and you know what? It works!
(Painted using Colors! on a Nintendo DS Lite.)