I had the real honor to work on the Chosen for Xcom 2: War of the Chosen. I was tasked with helping design the heads and create the final game asset heads for the game (model and textures). Most of the R&D work was done on the Assassin character and then brought over to the other two. The armors were done by the very talented Alan Denham. Art direction by the amazing Chris Sulzbach, who also lit and rendered the images for me. as well. (https://www.artstation.com/sulzbunny)