Ah, a new member of our forum. Welcome! Good of you to post, and we hope you'll learn plenty and post as much. You'll find this a very pleasant forum, with lots of helpful people.
This is a nice first try. My first comment would be that you have to take care of the sizes of objects. There's a landmark object in the row of internal objects, which you can resize and put anywhere you want. It won't be rendered, so you can leave it. This is very helpful to check sizes of trees and buildings. I get the impression your building is a bit on the small side. And the texturing on the building is off, seemingly.