Now, I know that some people may disagree with me here, but you should get at very least some more brick addons. For example, the windows, find a window addon to give more variety to you windows, not just the typical 1x4x5. Another thing, like everyone else has said, get rid of the 1x4x5 bricks, find a brick addon that can make it look less spammy. Another thing, like people have said, add some shape, plain rectangles just are not that interesting, unless there is a lot of detail (and by lot I mean alot). This is just my opinion.
And I wouldn't bother arguing with people who have been here twice to 3 times longer than you. You're giving yourself a bad name.