
Process for examples: Grayscale illustration > flatten illustration to one layer (Layer A) > duplicate Layer A, creating Layer B > apply gradient map to Layer B > set Layer B to "color" mode
I primarily use these gradient maps to add a moody atmosphere to completed artworks. I will use mostly the same process as I did in the examples above, but usually decrease the opacity and experiment with layer modes. Hard light, Color Burn, Overlay, Color Dodge, Multiply, and Color modes are my favorite.
Please use these however you like!