I've always felt that, despite the heightened and abstract stylization of the artwork, that depiction of permawhite skin is probably the closest to what it would actually look like. His skin is white, but you can almost see the blood just underneath. It's unsettling.
And in places where the blood vessels are more constricted (the area around your eyes, the lines in the palm of your hand, the ears, and so forth), the redder the color.
Try to imagine a tamer version of this: