Ego received an upgrade to her face and neck. Now she will not mutate into her "monstro-form" rather it will be an actual part of her. Those lines on the face and down to the neck are her actual full mouth, with female-like lips being as kind of disguise/pretty feature to not to scare humans who worked on her but not been a part of an engineering crew itself.

Also, I've been thinking about her name, EGO, and came to conclusion that it can be an abbreviature standing for Evolved Genetic Organism, so that it will make a little bit more sense (well, at least I hope so).

If you like the content and would like to see more, consider joining us on Patreon - cozy Discord server, WIPs, sketches, unseen concept art, raffles and more - just pick your title and enjoy the ride!~
https://www.patreon.com/dawnatsunset