@factual-fantasy
i'd like to add that the shadow color isnt necessarily dictated entirely by the primary light source, but the bounce light! so for the example of a sunny environment, the reason the shadows are blue are because of the light from the blue sky reflects across the environment; but, if the character were to be under tree cover, the bounce light would be coming from the leaves and thus the shadow would look greener.
Yee yee!!! You got it right on the nose!
Bounce light is something I didn't cover but I adore it!
Gotta work on my bounce light 💪
My good friends this is called using a
Gamut Mask
(image via )
James Gurney is an absolute master and gives really good clarity on colour techniques. Yes, it is traditional paint focused, but the principles are the same. Yes it is informed by the environmental colour but as a painting technique it is achieved this way!
I would also suggest that in digital processing, rather than apply a regular colour layer at a mid opacity, try out the different types of layers, Eg. Screen or Multiply. This can give you at least a starting point to help direct your colour palette.
