It would give a better impression of depth if you used some blueish tones in the further elements. One way or another it's a great piece, it makes me feel really comfortable looking at it.

This piece is really lovely, great colors and clusters. If I can suggest something, the framing could use a little adjustment. 

The thumbnails frame is awesome, it really pulls the viewer all the way from Left, to Right and then to the most distant part of the image via the 's' like green and flowers. 

However, in the larger image my eyes immediately follow the green from the left then over the water's edge, then they get stuck there on the far right. Its big jump in brightness to the mountain, or water, and I'm not sure where my focus should go (the super dark tree in the middle, or the up to the mountain or water, since they all sit in the middle of the image)

Give one of these a try and see what you think:

You can reduce the canvas, to offset the mountain and tree.

Move the tree further to the right, and bring the tree out of the shadow to give a bright path out of the rightside of the image

Heighten the canvas, adding more sky and breaking the symmetry of the image.

Maybe even remove the far right trees to let the viewer float off the image.