Movie shots are carefully framed and colour designed for story-telling and mood so it's a great study resource for all the beautiful images you might want.
It's funny how the more you learn about something the more you realise how little you know. Back in the days when I started colouring digitally I knew very little about colour theory, or light for that matter, but I knew what I liked so that made me confident in my colour usage. Since then I've gradually caught on to the complexity of the world of colours and light, which all of a sudden made it into something rather difficult.
Colour is one of those shifty topics where rules are rarely general and things are judged on a case-to-case basis. There's a lot that could be said about it, but the piece of advice that I keep stumbling across is "When all else fails, go by what looks right".
There's a great resource for pre-captured movie stills here - Leave me the white