Some notes (my brain can't organize thoughts right now):
-That bg really needs to go (is it a placeholder?)
-Everything is way too bright for a night scene.
-I love the colors/shading/contrast of the mushrooms - you should apply the same techniques to other parts of the scene.
-Internal black lines (on the flowers, rocks, and grass? for example) are flattening your forms.
-Avoid single-pixel highlighting against outlines (creates banding)
-Where's the water coming from
But really, you need to address what Ixis posted; it doesn't seem like you've taken any of his suggestions. I'll repost it for good measure.