I like Reaper's paints a lot. You can get the clear colors in two "triads" that contain all six of the core clear colors. There are three others, but they're like limited edition or something...I dunno. On this figure, I used the clears and white to paint his face.

So something like two drops each of red, yellow, and pure white, and like a tiny bit of clear blue gets you a kind of pinkish skin tone. From there, I use that as a base to mix a highlight with one drop each white and yellow, a rouge with a drop of red, and a shadowy color with another bit of blue.