I realized after doing my concept of a humanized GLaDOS that I had been working off her Portal 2 form, rather than Portal 1's. I then realized it might be an interesting artistic challenge to see if I can make a Portal 1 variant of my humanization, and make it look like it could transition between the two games with only some cosmetic changes.
The fun part was figuring out how to make her look more like her first version - thus the gray and the personality Cores. The other thing I decided to try doing is suggesting that my humanized GLaDOS' long hair is grown out from the intervening time between Portal and Portal 2.
A sort of computer Rip Van Winkle thing, I guess. So that meant I had to work out a short-haired variation of the personification's style. I really wanted to keep the duo-toned, "cover one eye" look, so that's why it's the way it is here.
I originally wanted to go with the style of my more literal GLaDOS humanization from a little while back, and put them on her back, but it just didn't want to work with this design. I then realized since her jacket looked a little military that making a pair of metal shoulderboards and sticking the Cores on those worked nicely enough. She's pretty authoritarian in Portal, anyways. >_>;;
I think all in all it worked out well, and looks believable for something that could transition into Portal 2. (I know I didn't show the bottom of her labcoat/smock, but basically I envision it and her legs looking the same.
Sorry for the sorta blah color on the background - I just could NOT pick a color that wouldn't clash with the Cores, her complexion, or her jacket.
GLaDOS and Portal are copyright Valve.