Evening work in progress
If you're looking for HDRIs as a quick way to light your scene, check out https://hdrihaven.com/ and be sure to support his patreon! He has up 16k hdris and they're all free. They're also organized by location, time of day, types of contrast, etc.
Hope it helps ya'll make more amazing art!
I use a ton of reference for color, composition, etc; and a lot of that comes from film. Here's a site with a library of film screenshots to use that lets you filter by series, genre, etc. :) Hope it helps everyone!