Painting will be very helpful for people with post-traumatic syndrome, or those who are constantly in a stress state. The fact that such activity calms the amygdale, i.e. the area of the brain that is responsible for generating emotions. When you focus on coloring pictures, you give your brain a chance to rest and relax.
Observe what colors your child is familiar with when they watch the characters as they meet them on a cartoon. Please note that the kid paints his favorite characters accurately and thoroughly.