Hey I remember this thing.
Finished it I see.
However I do see some issues with it.
Firstly, its too much of the same colors, and then all of a sudden you have the colorful bookcases, which makes the bookcases look awkwardly out of place.
Also you should try adding some tiled/print flooring, to see what that does to the build; and don't make those gray.
On top of that, you should make designated lights, rather than just adding lights to random aspects of the walls; it makes it look tacky and underthought.
Oh and add some interior walls, it really pulls together a build.
As for the exterior, I can only say that it needs a roof.
Can I rate?