Inspired by a Portal 2 DLC, this isn't really spoilers, so no worries my friends.
This took me a while, I actually sketched this one out a little while ago and took my time colouring it. I've tried a cel-shading sort of approach which I think works well because I've decided I'm too lazy for actual gradient shading. Same thing with the background, the Central AI Chamber is actually made up of panels that stick out from the walls and I was far too lazy to draw every single panel. Plus it would take the focus away from GLaDOS and her...babies...
I really like my GLaDOS...I'm very proud of how she turned out. I hope you all like her too (because like it or not, she doesn't like you).
Portal 2 and all elements/characters belong to Valve.
EDIT: Re-uploaded because there was still part of a colour reference visible.