I did a bunch of concept art on www.Deformers.com a few years ago, and never ended up posting much of the work I did on the project. It was a ton of fun to work on and I had a great time working with the team over at Ready at Dawn.
Most of these sketches are super early early exploration of an abstract world. I'm not sure if these ever made it into the game?
I worked a lot with Scot www.artstation.com/scot on this project. Check out his amazing work on 1886 the Order!!