Same here... it has nothing to do with the weekly challenge... 
He checked the challenge box. And there is no tentacle in the image.
ZBlazer: Who said anything about this being a challenge image? Also, if he has a tentacle sticking out of the water, it fits the challenge 
It seems like a good setup but I think it could use some refining.
It's simple, and I don't really like the way the rocks look (they lack texturing and are very blocky, they're not smooth and rounded like rocks in water tend to be), but I like that you just used shades of gray for the water, and the impression of falling water created here is pretty convincing. It could use work though. In particular, the rocks in the waterfall don't seem to make any break in the flow of the water occur.