I think I recognize a very familiar water-plane technique
That said, there's a lot that can be done here. I don't think the addition of those water-mines really helped at all,
for all I care you should remove them. You might also want to consider having a lesser amount of green and maybe
scale it down a couple notches, the rocks could also be tinted a tad darker and then you could add some "light"
doodads above them to give that effect that they're lighted where the sun hits them.
Apart from that, I think you should consider building the rocks a bit taller, especially the part on the left side.
I'd make a "pillar"-like rock formation there, and then I'd added some silhouetted rock formations in the background,
to give the overall feeling of depth. Hmh, that's really all I've got currently.