This is lookin' sexeh! I agree that you should do more to separate the character from the background. You don't have to overhaul everything, but tinkering might find you a nice improvement.
I really dig the no-outlines style. Except for on the bamboo-like structure, I suggest removing those heavy black lines. I'd also rework the shading on the rocks, that black line of shadow running horizontally on each rock really breaks the form, and to me it reads as the blue bits and the brown bits are 2 separate rocks, if you get me. Also because there's no apparent lightsource for the blue light. Maybe a more dull green light being reflected up from the grass? i dunno, just a suggestion.
I think you could achieve more depth on the hut, it kind of looks a little flat at the moment (at 2x, anyway). Play up the darkness of the receding edges maybe, see what you can achieve. The grass is a little too blue, imo, I'd shift its hue more to the yellow-green side of things, similar to the trees. Maybe play down the extremity of the highlights on the grass, too. All those white highlights kind of muddy things up, if you get me.
With the water, the backdrop is a little nonsensical. I mean, if you look at it, what borders the water in the distance? At the moment its a line of half submerged trees; looks strange.
The sky could benefit from some kind of subtle dynamic, such as a slight gradient to imply planetary curvature/atmosphere density. Maybe some kind of cloud thing going on.