I started with just warm colors:
Another layer of them, I like warm colors!
And then a layer of cool colors:
There are a lot of raindrops (or teardrops, I guess) in my work these days. It's not really a conscious thing, I feel the urge to draw them or paint them, so I do. They sometimes show at the end and sometimes don't. For now, I'm just going with the raindrop theme.