For pale human skin, my advice is to mix a
tiny touch of Blood Red and Yriel Yellow into a lot of white and use that for the base. Give it a glaze of yellow glaze (very dilute Yriel/Golden Yellow; or Gryphonne Sepia, if you prefer wahes), then reapply the pale mix. Add more white and yellow to highlight overall, with the addition of a touch of red to the mix for the lips and cheeks, for these results:
(I've added purple to the mix above the eyes for the suggestion of eyeshadow. I've found the trick is to be as subtle as possible – apply the real-world rule of makeup. If you can tell there's something there, you're doing it wrong!

)
For a paler feel, replace the sepia with a purple glaze (dilute Warlock Purple, or Leviathan Purple if you prefer washes), and use less yellow in the mixes. This will give the following results:
For a different result, use Dheneb Stone in place of the white to start:
For a pale alien/elfen skintone, start from a pale base of 50/50 white and Dheneb Stone with a touch of purple added, then add more white for highlights. Glaze with very dilute purple and glaze repeatedly with white.