Okay, one thing I’ve been meaning to put up as a color tutorial is this, because my other color tutorial used a pre-made one.
THE 70% OPACITY SETTING IS YOUR BEST FRIEND FOR MAKING A COLOR PALETTE FROM SCRATCH.
This is what I do when I’m not working off a premade color palette. I put down a big chunk of one solid color, brown, red, gray-blue, green, whatever. Think about the lighting here, the overall tone you want everything to be. Red is sexy and warm, blue is contemplative and serious, gold is rich. Then you think about which colors you’ll probably be using: set your opacity to 70% and put down a little streak of red, blue, gray, white, black, green, etc. Bam, you’re done; you have one neatly unified little palette to use. If you want the colors to be even softer and more alike, use 50% color. Then use the eyedropper tool for the rest of the picture.
The top bar of colors shows the way a garish rainbow can be tinted to fit. The red and whites are all different, see? And the lower bar shows that I put down a handful of completely random colors to start with, then just mixed them up on the fly. Each of those schemes would make a different sort of tone for the picture they colored in, but they’d all be unified and wouldn’t clash. It’s quick, it’s simple, it’s easy, and it really, really pays off.