I messed around with a character maker and attempted to make the characters in the Book of Human. It's not completely accurate but I think it conveys the general idea of their appearance.
Armun
208Please respect copyright.PENANACsocnzYGos
Arbella208Please respect copyright.PENANA74eC4fziix
Filiny208Please respect copyright.PENANAE6Lm9JelRC
Gatyk208Please respect copyright.PENANAxFTfqHhQpg