Okay according to what I figured out in the core book the X next to Cosmetic Augmentations must mean the number of cosmetic Augmentations you get. For example, having sparkling blue hair and tiger striped fur would count as two Augmentations.
But when I read the Chimera career in the Nomads sourcebook it says you can add additional Augmentation or increase/improve the value of an existing augmentation. So this makes no sense: how can you improve a cosmetic augmentation?
Also what sorts of cosmetic augmentations wouldn’t be…right for infinity? For example, using the tables in the back of both Blood of Angels (aasimars) and Blood of Fiends (tieflings) sourcebooks for Pathfinder, it would be odd for someone to have arms made to look like they were carved out of marble or to have a halo. Not to mention, hair that looks like fire or to give you fairy/dragon wings. Or even making prismatic shadows.