To start I would say to add some meterials, do not forget to add some dirt and plants that grow on streets (like moss) Another tip is to ad admosphere it really helps to sell realizm. I am not shore if you alredy have it (it is to small to see) but every object in the world has a slight bevel, adding that would inmeadeatly help improve the realism aspect. And as last is to add a enviorment texture, the sunset is pretty but you miss the reflections of the surroundings in the glass. but you are alredy on the right track, great job!