The town has been over thrown by sheep and pigs! Rawn away! 6/10 & A+ for effort. You're getting there; by the way, I see a ramp leading up to the one set of catapults, but the other three spots seem unaccessible/shouldn't really be there. Of course your free to do what ever you want, but just an idea when mapping is to make sure everything is accessible that would need to be in real life, and don't put them in random areas. Example: Those roofs should be wood with railings if they are going to act as catapult/defence towers/barracks. Just thought I'd give a bit of advice since your putting some effort in.
P.S: The debris on the roof, should probably be on the ground/path way to make that look more detailed if anything. Again, you can do whatever you like; just small tips.