Man, these are too fun to do. I always revert to doing this stuff whenever I need to just relax. I could do this stuff for days.
I started out with a quick render in Maya and then moved into matte techniques using photos and then painting in my additional lighting and details. I moved away from lighting the entire staircase like the render because I didn't want to distract away from the characters, though I'm not 100% happy with that deviation because it's not totally clear that another window is out of shot above Ellie so it looks kind of off. It mostly does the job and the general story sticks between Ellie and the Hunters.
Regardless, as always I learned a ton of new things with this one and it facilitated my excitement for the game for a few days! :D