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If you are going for a "Vampitonia": How about some veins on the (side of?) the throat and maybe very slight ones on the temples. The temples are the typical places where such a vein shows up.

Agreed! The temples, the throat, around the eyes and possibly the cheeks would be where I'd first expect veins. I'd try to find a reference with very pale, translucent skin and maybe extract the blue channel or do some similar filtering to make the veins easier to locate.

-- I'm not mad at you, just Westphalian.