I thought it was a map at first because of how square it was. That's probably the only problem. Add some towers or something. The vines are also weird looking and I don't think that cannons go well with this build.. It looks pretty nice though.
Someone could catch on fire from the lighting in that last pic.Don't try this at home!
The supports in the library also look funky. It looks like they're bending and about to break. I think it would look better if you made straight ones.