Tip #3. Decorate your space from dark to light, vertically.
A real "cookbook" way to make any space look good without much risk, Mark says, is to use darker color values for the floor, medium color values for the walls and light values for the ceiling.

"Any interior space replicates the outside world," he says. "The exterior environment is generally darker below our feet (the earth itself), medium-valued as you look straight ahead (buildings/trees) and lighter values skyward."

Tip #4. Study the color of your clothes.
Most people buy clothes in colors they like to wear and think they look good in. Similarly, you should decorate your rooms in colors you look good in. "If you don't wear yellow, don't get a yellow sofa," Mark says. "You're going to look sickly on it."