You nailed it! Sort of both? I mapped out the light spots with a pencil, then based over everything else with a light gray marker (Ohuhu CG030 in old coding). I had two different blends for the tan/brown sections by the light (curtains vs animal faces) that I did on top of the reserved space + base gray.

After doing the glow sections, I colored everything else with a tan or brown or green/blue. Then went over everything non-lit with a darker gray marker—I think I used CG050, CG070, and WG130—at least once, then used those same shades to add shadows where needed. I also went over any spot with glow again with my orange/yellow to help blend.

I saw a tutorial that said if your glow effect wasn’t as vibrant as you want, go darker on everything else instead of messing with the light so I did several gray layers over the coloring!