Hmm, best answer I can think of is that they’re mixing colours on paper.
You know how a printer runs with only cyan, yellow and magenta, but can print any colour?
Using values of red, green and blue in a similar way, plus black/white, can also create any colour.
It’s how TVs and other displays work – lighting up individual pixels in Red, Green, or Blue, a d allowing your eye to create the big picture.
On paper you can start with a layer of green like that, then layer red of various intensities – turning it different shades of brown. Then add blue for shadowy areas, or pinker areas.
Many people choose to draw in grayscale digitally, get all their shadows and highlights in, and then add colour. This person seems to be skipping the gray and jumping to a base colour, but is clearly also drawing in their shadows and highlights.
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