From the Painting Guide: The first step to being bolder in your painting is to give yourself permission to experiment and to "mess up", not to start with the objective of "getting it right" or to create the "perfect" painting every time. Take a look at my article which gives 10 Tips for Loosening Up; now select one things that you're going to try while painting the same scene as you've got here. I'd suggest using unrealistic colours, or working with a big brush, which reduces the amount of control you've got.
Take three unrelated colours from your paintbox – a light, medium, and dark – plus white, and put the rest away (so they don't tempt you). Now paint the elements in the painting in these three colours only. Think about what tone something is, or how light and dark, rather than what colour it is.
Take a look at the version of your painting below, which I manipulated in a paint program, adding lots of red. Notice how different it feels to the original; the rich reds and yellows give an overwhelming sense of warmth – even if you don't like the result!
Also take a look at the paintings submitted to the Fauvist painting project, where the objective was to use colours "that represent your emotional response to or feelings you get from what you're painting, rather than using the actual colours of the subject".
