I reaally like the colors you used here, and I think it's good... but a couple crits here.
It's a little strange that the size of the ripples in the river farthest from us and closest to us are of the same size. :/ And the fact that it is straight all the way through is weird, too. It would look much better if the... ripples... at the front were bigger, and a bit more wavy, especially where it hits the smal island part, it can't hit it directly, it would curve around. And maybe some ripples would come back.
Also, the light part of the grass... It looks like you used a whitish brush to brush over them. Well, it makes it look like that the lighting is floating on the grass, not on the grass. Since it looks like it's a grass brush, you could just lighten the color of the grass itself to a pale-greyish blue-green color to draw the edges. ^^
I really love how you did that sky though, look at those purtyful colors