there was a little bit of alteration in the AVP drone designs, but since it was so dark, it's not easy to see the creatures, which probably benefited the film a lot
I wonder if the Alien 3 adult alien counts as two alien designs, because there's the man in the suit and the rubber puppet that didn't look the same. But the lighting made them interesting in some photos. Fincher had the best cinematographers he could ever have wanted