I'm curious as to which colors and mixtures our community of painters typically employ here? I find that there is really no set rule as to flesh color. You merely paint what is in front of you and that does the trick. The problem is, our eyes can be deceiving and prone to seeing colors that may not be there, or may not be as strong or as weak as they appear. Lately I have limited my color palette for figures to just a few colors: Yellow Ochre, Cadmium Red (or some other red), Raw Umber, Ultramarine blue or Viridian, and of course the usual suspects, black and white. Blue, Black, or Viridian, seem to work well for the grays which are very common when looking at human skin. Mixtures of Ochre, white, with small amounts of black and red make a good general skin tone that isn't too raw. Of course there are painters who will use many other colors but here I am only describing a limited palette I personally use.