ZBrush as a Character Design Tool - ZBrush Creature Design: Creating Dynamic Concept Imagery for Film and Games - page 45

light to help carve out the figure from the background. Always avoid broad flat lighting with no temperature
contrast or rim lights, as it creates a very bland image with little depth.
Figure 1-42: Warm and cool advance and recede with basic shapes.
Figure 1-43: Using temperature contrast to pull the character from the background