Leveling is like graphics with pre made material so let's see what I can spot here.
-Your pillars need to stick out, as of now they are flat along with the wall with something that is supposed to look 3D (2nd image)
-When you do make them stick out the walls overlap and it looks funky (3rd image)
-Add doors >=0
-The house on a house looks weird, the roof is too bland I think is the reason (1st image)
-Utilize NPC images to give your levels more color
-I don't like that floor design
Good Luck!