What does a vampire really look like?

Paul Barber says it best in Vampires, Burial, and Death: Folklore and Reality (New Haven: Yale University Press, 1988):

If a typical vampire of folklore, not fiction, were to come to your house this Halloween, you might open the door to encounter a plump Slavic fellow with long fingernails and a stubbly beard, his mouth and left eye open, his face ruddy and swollen. He wears informal attire-in fact, a linen shroud-and he looks for all the world like a disheveled peasant (2).