Try experimenting with a tad more grays for the walls, maybe something lighter or darker. Other then that looks pretty good.
at this point it would take a while!
The castle should be a bit brighter, you should of put the town in the main post. Its one kickass place. That moves my score up to 10/10. You lucky 
ha!

to you too
I FORGOT TO SAY! the gates, drawbridge, trebuchet, and catipults are evented!!!
heres more pic:
the entrance to the inner courtyard, with main gate and rotating drawbridge.