I was wondering, do the contact lenses override red eyes for vampires? The vampire skin and red eyes is just a whole body tattoo which isn't genetic. But I was wondering, since the game also recognises the vampire skin and eyes as "full face makeup" even though it is a whole body tattoo, not proper face paint, and can't be removed from vampires under normal circumstances.

Afraid I can't answer that -- I haven't had any vampires for a while. Last time I saw on e of the Grand Vamps, they didn't have the right overlay, so something's off with my game and I can't even test the set for you until I figure out what it might be. Perhaps you could use the Creature Painting to experiment quickly? http://modthesims.info/download.php?t=283201

I wish I could, but I'm currently using a laptop, and there's a bug that stops most of the content from Nightlife from appearing properly - it's almost as if the Nightlife meshes are unlinked - and I'm not using my PC to do it until I get it upgraded. So unfortunately I won't be doing anything about it just now.

I've figured out how to change a Sim's eye colour with SimPE by going into a Sim's character file. For the default eye colours at least.

I just tried this on my alien twins boys (neither of whom have alien eyes!) and it worked like a charm. Thank you so much for the tutorial.