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Hmmm, Very dirty water :P
The ground here looks very strange, what did you use for your ground texture/displacement?
Also, I really like your composition, I think maybe it would be really great if you put some wildlife drinking out of the pool or something. though thats just a bit much probably.
overall I would say that the detail in the ground needs a bit more work, but I like the overall feel of it.
Thanx!!! Animal models are out of skills here!!!