Best to read a traditional art book on colour, and use the knowledge gained to fit to what mood the work is to convey. Eg Color Choices by Stephen Quiller.
Nature is the best artist, a nice scene from her would be roughly a subdued dominant and subordinate colour plus a few highlights of pure colour. say a large area of green plants , a smaller area with pale blue sky and the flowers for the pure colour highlights here and there.
I see this is an somewhat older thread, but for future reference or maybe it helps somebody else. I agree with @Drifter in that it's best to teach yourself a little bit of color theory to know a little more about it. It's not that difficult and can help you a lot. There are also some real nice color scheme pickers online that help you with picking colors that fit well together. Like coolors.