I see a great potential in this image, but also compositional weakness.
Like Roland, I love contrast and color gamut. But my eye is randomly moving from one element to another without much rest.
I think the weakest part of this composition is framing/cropping. I would definitely get rid of the trees on the right side. They produce a very fake, artificial effect to the scene (even if they are the most authentic and organic element of it). Well, actually, the way trees are lighted produce that effect.
Why not make this frame into a square, cutting right along the right side of the high rampart - getting rid of the lower wall and trees behind it. You may also want to trim a little bit on the left extreme and on the bottom - to make patterns of light and shadow better proportioned and geometric. Just a suggestion...
