Got a comment before about whether it's necessary to do grayscale lighting before coloring. It's not. I do it just to reduce the interference of color so that I can focus on the shape of the light. It's my favorite step, I would do this in almost all my art except doodles.😋
Fell asleep last night (
After this, you can try to transfer these shapes to your own work
And if you have a full light/dark shape, they can also help you do more experiments with colors
Example from book: アニメスタジオで教わる背景画の大原則 神技作画シリーズ