Well nice idea and the castle is looking good. Try a few different textures for the castle I think we are seeing too much of the same texture. A way to think of it is the outerwalls woudl be built differnt to withstand attack so you can make the outer walls out of one textre the inner buildings out of another. (maybe make the roofs a brighter color would break things up too. ) Maybe a few windows on the interior buildings will spice it up a bit.

The wit of a misplaced ex-patriot.
I cheated on my metaphysics exam by looking into the soul of the person next to me.