Colours are use to Express EMOTION

Colours are use to depict moods and artist cannot do without it, use dark desaturated colours to express seriousness, use bright colours to express friendly.

Looking for a way to show emotion in your artwork? It’s simple: Show your true colors.

Color can be a powerful way to convey emotion in your illustration or fine artwork. It can be used to create  a literal mood, such as a blue-grey rainy scene or a bright yellow breakfast nook in a kitchen; but it can also be used more figuratively to subtly evoke emotion through objects and characters.

Let’s tour the rainbow and discuss some of the ways that each color can be used to convey emotion in your artwork.
Source: craftsy.com