Looks great! Composition wise it's horrible heh (ie. left tree in between valley in bg, which in turn is behind the rock, which is in turn behind the mushroom, to say the least)
But I absolutely love the colours used, and the texturing you did. Ok, the crits which you can take or leave.
1) I think the trees should lose any outlines, as it just kills realism (as akaline kindly provided, but not 100%). Don't forget the top of the right tree.
2) alkaline's edit upping the darkest shade color in the trees is a good choice, makes it more consistent with the rest of the peice.
3) The grass area on the bottom right is interesting at the bottom (bush silhoette at the bottom) because there is some variation in the grass, and with the silhoette, but as you look upwards it's one big mass that looks similar. (no grass in the grass, dark spots, overgrown grass etc)
4) I don't think the edit of the silhouette works in alkaline's edit, or maybe even the original. The silhouette makes the image look more crowded than it is in the first place.