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I think the most important tip here is not to use neutral gray shadows. I’m no artist, but I’ve heard that an early lesson for all painters is never to use neutral grey shadows. They need not match the hue of the object they’re falling on, I don’t think; a blue tint is sometimes recommended.

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Thinking about the effects of subtractive colours with paints never maps successfully onto additive colours we have on screen. In fact the way in which say blue and yellow make a form of green by subtraction is fascinating and explains why you can never mix a really bright colour. There is no equivalent on screen as far as I know.

I was taught to put my black paint away and never ever use it! You really don't need it (unless you want to paint something that is actually black).

(amateur painter) Generally, shadows have a lower chroma and value than the color of the object.

If I'm painting a purple sphere, then the cast shadow will be a much darker value of purple.

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