........... your question is incomplete !!!!!!!!!!!!!!!!!!!!!!!!!
Take anything (cloth, shoe, wheel.....) and experiment how the color changes when it's indoor, outdoor, near a camp fire.......
I highlight my figures in relation of what is the light source.
I add small amout of different colors in my highlight.
Exemple : there is cadium or naple yellow in a zenithal daylight.
Red, orange, rose in earlier morning (sunset).
Bleu-green-grey under a nice moonlight.
Orange and Red near a fire.........
So your Olive Drab cant be highlighted without more informations.
Never forget this :
THERE IS NO COLOR WITHOUT LIGHT !!
JP