Making color scripts helps a lot aswel. What you do is design a color scheme, by setting local colors. For example decide what is the color thats not effected by light? what is the color of the light? and what color does the atmosphere has, sky is blue, but when your setting is in site, there can be a different atmosphere or a second light source.
When you are satisfied you start with the real thing.
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So the local color in the light is changing to the color of the light source. The shade side is mixing with the atmosphere. In this painting it very exaggerated but it makes quite clear what I mean. Now don't forget that when you keep asking yourself 'Am i doing the right thing?' you will get stuck and that doesn't help at all. So keep lose.
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It helps me to stay on track.