Did you know that there are over 1000 colors of human skin tone?
This Brazilian artist has been taking photographs of people and matching each subject’s skin tone to hues from the Pantone printing color chart to codify a unique chromatic inventory. (https://news.artnet.com/art-world/4000-skin-colors-in-pantone-squares-1254683/amp-page)
The key to colorful portraits is getting the values right. Try flipping your image into B&W to check your values!