I've been experimenting with a different shading method.

It's old news to the art community, but I just recently figured out how to use it to its full potential.

This method uses clipping masks and a few layers of grays and whites to add tonality. I then duplicated the layer I used to apply color and made it more saturated before setting it as a mask. After I set it as a mask, I brushed up on a few areas where the light hits the brightest to give it a warm splash :P