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
Received a DM to ask me how I do lighting practice. This is the way I usually make it, using some of the features in drawing software that can help you find the shape of the light better.