I already said "saturation and low contrast". Image is very hard to watch especially in part here shadow color is combined with basic color. Maybe because compared to basic color shadow color is very desaturated. That combined with green color simply hurts my eyes. A lot of people here suggested that gray color or some desaturated 50% dark color should be used as working background, cause it helps with picking and adjusting colors.

I mean could you (or anyone else) be more specific. I've messed about using more saturation and contrast but to be honest I'm not convinced with the result which is why I have nothing to show at the moment.
You should always try to find more information on the internet, cause this things can be learned (and btw I'm not color expert), and never be afraid to show result, cause it may help people to help you. It shows that you are ready to try and put some effort into it.