Basicly,the water is your only problem.It's solid,and it should have more colors blending in.It also should have reflections.And...wavy-ness.I think dodging is a nice tool to use for the water.
I agree. This is a nice start. Put some colors and reflections in the water.. and some dodge/and burn highlights and shadows in the bushes and rocks and this will be very nice , indeed.
It's a very nice piece. You've set a place in my mind very well. About the water, I agree it could use something, perhaps just around where it meets the ground.
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