Ok. Seems my "issue" is "resolved". I checked on different Caitians and Ferasans and the facial patterns are "back". I swear they weren't there before, though. And it also seemed like their availability would come and go. Perhaps it's a glitch I'm experiencing with the Tailor where certain options disappear occasionally. I know I've experienced this with customizing my ship on occasion, which I can usually "fix" by exiting and re-entering the ship tailor.