Well, thank you! To be honest I forced myself into this kind of thing with Strays and I have to attribute whatever skill I have with backgrounds/nature to it. I’ve been forced into drawing nature in that for like 8 years now.
My best advice would be to look up scenic pictures and draw from them. You can’t get much better reference than real life and I often use it myself. Most of the sketches I did on those two brush pen pages were from refs I Googled, I just hyper stylized them.
I also look at scenery that other artists have drawn that I enjoy and try to replicate what I like from it. Sometimes you can pick up tips and tricks just by redrawing something someone else made and seeing how they did it. I pull from things like anime, cartoons or movie backgrounds as well.
I’m not sure if this was helpful, but good luck! :)