15 Exaggerate the light and shadow
It’s not easy to depict glow evenly from a light source simply by drawing. However, it can be done using an Adjustment layer, Layer Blending mode and mask. The Color Lookup layer always surprises me. It’s like a happy accident. I usually just press the down and up arrows to select the different settings and see the result on the screen. I usually use the Candlelight. CUBE and EdgyAmber.3DL settings, available from the 3DLUT File.