Paint direct light into the scene
Next, I create a new layer on top and name it Direct Light. It’s important to remember colour temperature at this stage. I use a cool neutral colour for the shadows, but will be going warmer and more pure with the highlights. I begin to paint in the light areas where the multiple light sources fall on the character, using warm greens and yellows. The creature is starting to take shape.
Consider reflected light
Within the shadow areas, light will bounce from lit areas and produce reflected light. I create a layer under the direct light layer and name it Reflected Light, then select a colour that’s a little warmer and brighter than the surrounding shadow colour. Subtlety is key: I want to only slightly adjust the values. I imagine the light source that’s being reflected and model the form.