Ambient Backgrounds

Hey Kienan!

I've recently been improving on all things characters. Expressions, proportions and colors etc. However, where I lack skills are in the backgrounds. I seem to always fail with making my characters seem like they fit into the environment no matter how much I use that valuable ambient blue lighting from the sky or reflective lighting in my piece. I always end up just removing the background or leaving it looking like a mess.

How do I go about creating more ambient and interesting backgrounds? (As for an example the one you made for the casual D'Va piece.) Thanks!