I don't know the hills are too yellow hued and your guys skin is too red, other than the anatomical problems on him and porportions (His head is too big). The grass, the trees, and you guy have no indication of any clear lighting from the sun or otherwise, everything looks
pillow-shaded.Digging the water though, but like everything else, throw some dark colors around.
Alright, took a closer look outside of FAILFOX 3 (thanks default bi linear blurring.)
Why are you using so many colors that are all the same pretty much? you use so many colors that look the same. Everything is getting an ugly pillow shaded/blurred out/washed down look to them. Use less colors. Make them each count.
Your also dithering in such small places, not needed. In-fact it's contributing to the problems.
Please excuse my horrible edit, maybe I was drunk at the time, but perhaps it may help you.
I played with the head and arms, plus some colors on the guy and I fixed a few issues on a few things here and there