Maybe if you gave us some more information it would be easier for us to give you help. Like for example; what the icons are for, what they symbolize, what you would want them to look like... and also maybe show the other ones?
I think that car is very cute, and it looks just fine. But as I don't know what you're aiming for it is a bit hard to give you c&c. One thing though, is that I think 18 colours for such a small thing is a bit much.