Aida showed me this cool trick a while ago and its turned into a HUGE staple with how I light things now! Gradient Mapping in photoshop is a subtle way to change the colors in your work and works just like a photoshop mask layer! Meaning, you can change the transparency and how much of what part gets the color influence. 

Gradients are also 100% customizable but photoshop is programmed with a few core staples for dramatic and vibrant lighting. The key is finding the saturation you want or like for the art you’re working with! I cant really teach that. 8D

hope this helps others! Play with your lighting!