Control

This is driving me crazy. The more I try to control my painting, the worse it looks. When I choose colors at random, without even thinking about it, and paint as if I couldn't care less how it turns out, the work looks great. Then I get cocky, and think I can do something specific, and the work sucks -- big time.

Am I doomed to create only random works of art? Will I ever be able to plan out a project ahead of time and make it look decent?