3-5 colors opposite on the color wheel
a)Cool Colors
b)Analogous
c)warm colors
d)Monochromatic
e)Complimentary

E:complimentary because opposites enhance each other and make each other pop.

The answer to this is a

He could go with d. temperatempera coloring is very precise and can easily be used if you have the skills necessary to paint hair. this was commonly seen in religious paintings made with tempera techniques. the first tree are not that much about fine details and photorealism and are more about vivid colors and expressiveness.