I really like what you have cooking here! There's a wonderful alien feel to the landscape and the isolated building that just brims with a dream-like quality.
I feel the piece could really profit from some tighter work on perspective. The horizon line looks about at the midpoint of the picture. The projection of the building in relation to that horizon line implies the building is slanted down towards the viewer, which kind of breaks the consistency of the piece.
Compositionally there doesn't seem like a lot of strength. At the moment my eyes are led straight to the building, but in a bizarre way the sense of movement in the image feels like the mountains are pushing out against the wave in a kind of defiant defense. I would bring the building right over to the right of the image, and concentrate much more on developing a feeling of movement of the wave invading the scene.
Try being more decisive with your use of shadows (particularly black) within the composition as a whole. In this case I would use it to control focus on the building, isolating it from the rest of the landscape to imply vulnerability.
Maybe harmonise your hues a little more. There's browns and reds that are working fine, even the purple works, but you've got blues, greens, purples, browns, black all kind of isolated in their own space doing their own thing. To harmonise you need to bring the colours together and work them off each other. I would try culling a couple of the hues first and flesh out the image, then see if there's places for more colours.