It doesn't matter what the artist paints—apples, flowers, faces. He always paints light and shadow. He searches for the color of the light and the color of the shadows. And if the light source is the sun, then the colors of the shadows and objects are unique.
The artist's entire theory is on my paid channel: https://boosty.to/svetlanarodionova
If YouTube is no longer available to you, here's my koala on Zen: https://dzen.ru/id/622cb8dee818d15e87...