I have addded textures to my buildings, added stars in the sky, a moon, bricks on the street and lights in the street lights. I used lambert matterials to add different textures to each item. The only problem I had was that I was using the same lambert material for the walls of the house and the moon so all of the walls became moons. I simply went back and created a new lambert for the walls. Also I have had to add 3 new windows because I forgot to add them earlier.