More detail to the buildings and also adding in fountains, statues, monuments, etc. I am also including random people, mainly to keep in mind the scale when adding details such as windows and doors to buildings. The monuments, baths, statues, etc. are done as vectors and then transformed into an isomorphic projection. I use Illustrator CS6 for most of these, but photoshop ex CS6 has some really good vector tools too.
