I've done a little bit of falling light effect to my left side of the face. Now I would like to correct some colors of the image.

Color balance layer.

human creative painting

Levels layer.

human creative painting



human creative painting

Here is the result in details.

human creative painting



human creative painting

The final step.
 
Create a new layer and set layer mode to Overlay. Choose a low flow any brush and pick something like red color.

human creative painting

Overlay the areas that should glow, as you think.

The eye, the Nose and the left border of the face:

human creative painting



human creative painting

And we are done with making a face of the monster illustration.

human creative painting



human creative painting