I think the main concern here is the lack of pictures, from what i can tell the overall structure of the build is well laid out and it looks somewhat pleasing. Brick count aside i think more work could be done to the surroundings of the castle, for example the island. If more work is done it is possible to thoroughly see your skills.
EDIT: I have seen it in-game, i have to say i much like the interior as it and exterior of the castle but my decision stands do some more island, perhaps a smaller fort somewhere on a beach, along with this some non repetitive details, such as barrels or something then you could get the spot.
Also show us some of your other builds, that would be appreciated. ;D
Also some of my favorite angles of the build by World Anchor:
