A set of gradients for different skin colors is quite varied.
the preview:



The way of use is very simple
Go to the Edit section -> Tonal correction -> Gradient map
Go to the Edit section -> Tonal correction -> Gradient map
Then they select the "Add Gradient Set" option and select the set of their choice!
※Recommendation: To make the effect cleaner, separate the lineart layer from the layer you are going to use. Also, you may need to add lighting according to your drawing style!