It seems very professionally done, specially the flow that it creates from left to right, and how the image doesn't just focus on just one place, it pulls your eye from left to right. great job on the water, and the waves, seems very realistic. Waterfall is really amazing, specially the glow it has makes it look realistic. Nice job on getting the foreground elements with the wood piece and the rock on the left. But I think that you should focus on the castle's detail a little bit more, the rock and the waterfall under it is more detailed that the castle itself which grabs the attention to the rock, not the castle.
Great job with the lighting of the castle, and the mountains.
Wow, this photomanipulation is great! You really put the images together seamlessly and made it all work. There isn't one focal point your eyes are drawn from each part of the image to another. Amazing, love it!
Very well done photo manipulation. The only critique I would suggest would to be, like others have mentioned, to have the rocks match the background a little so it does not distract from the castle. Maybe add a little blue to the hues?