Learn the Rules
The other day I was visiting with another painter who is taking a color class. She explained that the instructor was adamant about the rules for color mixing and use of color. It sounds like the teacher believes one should not deviate from the rules.
Seems to me that it is important to learn the rules, know those rules, but then break them when you desire. Breaking the rules might lead to one of those ' ah ha' moments or let you create something fresh and exciting.