I'm really liking the castle, but the base map you're setting it on could use revising. The water just isn't working for me, it looks like you've taken a close up photo of small wave action in very shallow water, at the very edge of the surf. (as in it looks like what I expect to see water doing when it has spread out to just a few mm deep, high on a long sloping shore. This isn't how I expect to see deep water off a rocky coast acting.)


Honestly I would almost suggest looking into rendering the water as its own 3d model. I know there are several tool sets out there for doing so. It would give you far more control over what you are doing.

One other thing, as currently rendered, the 'watefall' looks more like some kind of channel level with the rest of the water. Might help if you rotate your castle a little so we're not looking squarely at it.