When objects or colors are similar or alike they are considered . a
analogous
b
continuous
c
monochromatic
d
secondary

Do you have a link to the reading?  

Iwould say 2: rhythm and repetition

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.