Here's a mini breakdown of how I do backgrounds quickly for a comic set in a videogame. Having the environments on hand is extremely helpful.

i'm writing the comic timeline. i'm bad at figuring out how much space to leave for timelines

Oh yeah since chapter 5 is out I can post the ref sheet for that chapter. This was for my own use so it's kind of messy, but I use this to make sure I keep outfits consistent from panel to panel.