They create visual contrast and harmony, making each item stand out while making the overall image pop. Using the color wheel, you can create all sorts of great color schemes. It's all about finding the right color pairing for the right occasion.
Colors can also affect the composition of a painting
1.To harmonize (or the opposite, to contrast)
2.To unify a scene.
3.To set forth a visual path.
4.To produce rhythm.
5.To create emphasis.
Artists use colors to create depth. Warm colors such as reds, yellows, oranges, and red-violets associated with the sun project toward the viewer. Cool colors such as blues, blue-greens, and blue-violets that are usually associated with bodies of water appear to recede into the distance.
