This... is beautiful.
but as the other deviants have said, the water needs something more, something like more detail when it comes toward the foreground. I love the pink and blue flowers near the front of the picture. unless you were aiming at those flowers to be the focus, i think you should take a little less reflection of light off.
as for the tree in the background. the one that curves and has small vines, it would look better if you gave it a darker color than that of the surrounding grass. and a different color than the trunk, something brown. just to add a bit more contrast.
other than that, there is nothing else i could possibly point out that needs improvement. great job!