Deviation Actions
That's a nice work, the colors while fitting very well together help to create a dramatic sense of fantasy. However, there are things that could be improved, like some parts where you can easily see it's a photo manipulation. Especially if you take a look at the two waterfalls in the front, the colors are really too bright and white, since the weather is a bit dark with a reddish sky, the waterfall should follow this - like you did with the waterfall next to the castle, you made a good job with that one. A helpful tip is to always change the colors a least a bit in each photo using Color Balance (or anything similar if don't use PS) to make 'em fit the overall mood/color scheme. For example, if you wanna put a white bird on a purplish sky, you might think color adjust is not necessary, but if you use Color Balance to make the bird a bit purple or towards this color you will see the difference and how it blend the photos together like they were one. You could also add a very smooth mist around the waterfalls I mentioned, especially where they meet the river.
Another thing I could point out is the mist you added on the river, which is too sharp. Perhaps you could make it smoother and more transparent.