Things that need to be improved after staring at it for awhile:
- Flag at top needs to be re-done. Eew.
- Needs a richer interior, like red-and-black print tiles on the ground, etc.
- Get rid of that whole rocky-area. If you don't want to, at least take away half the grass.
- Elevate it, dup it up, and build some more outsides as well. Maybe a draw-bridge would be a good idea, as well.