The yellow and the green do go really well together hand in hand. I guess they would be complimentary but I don't have the sharpest nor greatest intuitive eye to pick out good colour combinations.

I agree that it does look like a body of water. I'm at the coastline looking over at the ever expanding mass of water. It fading and going to a lighter tone as it merges with the pale, sun dyed background.

You are getting better and better with this digital painting work @thecryptofiend. Keep up the great work buddy! :)