Colouring - first non Graphic Design post

I figure may as well put up some non Graphic Design posts on this blog (even though though there's only been about 2 visitors in it's entire history. If you're reading this, you're number 3)

I think it's fair to say that I'm pretty crap when it comes to colour. Therefore, I figure it's the area I should practise more. I coloured this image of Ott and Bird, trying to use a simple 3 colour lighting method.

It looks a bit clip-artish, and I don't really like the shape of the highlights on Bird's head (not to mention the cruddy background grass/flowers) - but I guess for a quick practise it kinda worked.

I should probably try and move away from using too many primary and secondary colours; I think that's what gives it that clip-art feel - especially the background.