I've done a few vamps in the style I think you mean.
I started out with my basic flesh and added white until it was a very pale flesh. Use this for your base. Then add more white for the highs - you may end up with almost a pure white at the top, but try to tone that down just a bit. For the lows, I mixed in a gray until I got the value I liked, then tinted it slightly with prussian blue. You can achieve a nice effect by adding (as an undercoat) veins and blotches with a touch of prussian blue and then cover iwth a thin coat of your flesh.
If you want some other ideas, try some of the garage kit sites and get ahold of AMiazing Figure Modeler magazine.
Good Luck.