Au Ra physiology and other lore.

[Blueyes]

Regarding the horn and face connection, if you look at the earlier renders of Au Ra, there are different combinations of faces and horns (males on their own have two or three faces shown with one horn style). It's doubtful that they would make them exclusive to each other now, so I wouldn't worry about that.

I'm not so sure. It's important to note that there are options to add additional scales to the face as seen here and here which also appear to vary depending on the horn style. It can give the illusion of having a different face when in reality it's just the same with added scales. An example would be this image which has the same basic facial features as the male Au Ra shown above, but with added scales that overlap to create a different look.