Hi Ken.
I am not Marvin, but here is my perception of the theme.
When painting portraits you work with very limited colors in the flesh tones. Instead of mixing Cadmium Yellow, Cadmium Red, Viridian and White, you simply use Venetian Red and Flake White. It is less hazardous, and therefore easier.
The Cadmiums are so strong that you will never need a color that strong. The earth colors are closer to what you actually need. That
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