16. Background is step one. Step two is to take the small roller with the lighter color and follow the crack. Gradually roll the small roller into the background so that it creates a graduated light color on the darker base.
18. Now use the large brush to pull the dark on one edge of the brush and the background or light on the other edge of the brush. Giggle the brush to blend slightly as you pull it towards you.. You are following the edge of a crack. (real or illusionary)