Darken the scene
Using a big Soft brush, I darken the piece overall slightly. Many times throughout a painting, I’ll notice that things are looking too dark or too bright, or that other adjustments need to be made. Try and get in the habit of noticing when your painting has a problem, and react accordingly.
Using a Soft brush on a Multiply layer, I brush in some ambient occlusion. Occlusion is when light can’t reach into tight spaces, making it much darker inside them – such as in the ears, nostrils, mouth, neck and folds on the jacket. I like to exaggerate occlusion and have it very clear and present in my paintings. I love its solid, clay-like feel.