Looks good. At the moment this sees to be more of a manor house than a castle, but a truly amazing manor house at that. I'd make sure there is some form of guard house at the front door and any other entrances. Also, I'd suggest some walls along the side of the moat. A moat is fine and well but all it takes is a few bits of wood and the enemy are inside.

I like the east wing with the trophy room and the library. Do you have specific thoughts about how well defended this should be?