Awesome to bring up that they are weirdo space vampires. That’s part of the flavor that sometimes gets pushed back a bit. I think the pale is a good idea on paper, but it does look a little unfinished at a glance. I think a super watered down glaze of a fleshtone just to tint, and then painting the hair would help. Maybe give the sergeant the tiniest drip of blood out of his mouth for more vampire flavor.