I agree about the saturation, but I also think that some things (eg your main sprite and the petals on the leftmost flower) blend in too much with your background
I would probably add some darker outlines on at least the shadowed parts, just to create some kind of border. Also, the sky could use some variation from the one blue, maybe some kind of gradient would be nice.
I also had a hard time figuring out what the things in the bottom picture were until i zoomed in.
What's funny is that when i first saw them, they looked like some girl, with the wings (i think thats what they are) being the hair...
Finally, i think that the rocks look too flat. Maybe that can be fixed once you determine exactly where the lightsource is.