I will introduce how to finish the illustration with depth by adding one effect.
Example: Image size 600 × 440 pix
1Select the created illustration and execute 【Edit】 → 【Auto-Coloring】 → 【Full-Auto Coloring】.
2 will make the executed layer.
3 By changing the effect of this colored layer, you can create a profound change. It is interesting to try variously.
Example) Overlay 100%
Example) 35% hue
Example: Hard light 75%