I was inspired by scamorore's tip to stick with only a few colours. Also I wanted to use the acidic green color.
The piece looks way better with pitch black background. Like this: http://imageshack.us/a/img832/1791/ch8.gif
Reference image: http://images2.wikia.nocookie.net/__cb20120325123628/warrior/ru/images/5/54/E54ceed398_127404.jpg
I wish I had 3d model or a toy boat - it would have helped me a lot.