I did some Googling, and this is the reference I used.
That really is astonishing. Did you use anything as a reference, or just make it up as you went along?
The studio's Scourges have black wings. I assume they were painted that way to fit with the color scheme (and possibly in order to meet a deadline), but it didn't make sense to me that the flesh on a creature's wings would be a radically different color from the rest of its body. I started work on the wings the same way I'd been painting their skin tones and worked from there.
So... I was going to make a joke here about using the Honduran white bat as a reference.
(There are much cuter pictures of them than this and you should google them.)
But... there's one head in the Scourge kit, which happens to be on the model I'm painting now, that has short, poofy hair.
I think I need to repaint that hair now, because I think the next Scourge really does need to be subtly based on Honduran white bats. (Seriously, they're so cute!)