Now it is up to your judgment how you would like to alter the image, but trial and error is the best way. If someone looks too pale or bluish in the face you might drag the white dot in the middle of the color wheel labeled “whites” more toward the yellow and red side of the color spectrum.
Essentially you drag the white dot around on each color wheel until you find the image a satisfactory color. If the subjects clothes are a dark color but look too understated you might try and bring the brightness up on the blacks, and if there are bright white glares on their face then you could try bringing the brightness down on the whites. It is all up to how the image looks to you and how you would prefer it to look.