Wow! This is really superb. I, too, was feeling the urge to create a decent keep for the Dragon Knights. Looks like anything I tried to build now would just pale in comparison to what you've already done. :) So many great things going on in this MOC: moat, foliage, collected gear from "the good guys", ale house, cobblestones, wizard tower...the list goes on and on.
I especially like that you used a little bit of the color scheme, building style, and techniques from sets like Medieval Market Village. It seems like an homage to current Kingdoms/Castle sets (this is a great idea since it ties the MOC in with the rest of them). It makes me wish this set was available for purchase :)
Great work!