i think that the dark parts are bit too saturated mainly in the grass. there is also this extremely saturated brown that can do with a little desaturation. I think the grass can be solved with a darker shades as Morgengrauen said.
I think the only other thing ruining this piece is the logo.
Psst add more colors, 13 is an unlucky number.
i like it really what you did with light and shadows, although the grass could use one or two darker shades. some more random stars would be good, too.
I think it could be much improved with more of a definition between dark and light. The grass to the right side of the house just kinda.. maintains the same color for instance. Otherwise, I'm a sucker for LOTR, and I like it.
You'll have to change that preview pic to something related to the image, such as an excerpt from the image. Right now it's just an eyesore. The piece itself is nice, but could use some more contrast to create depth, and the grass texture looks a little scratchy.
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This one feels pretty unpolished, but somehow I find it pretty cool. The saturated colors are probably responsible for both things.