I like the subtle coloring you have right now...I see some green and brown. If you wanted to add some color then I'd put in some lakes and then you can have some blue. As for cities it's up to you really. Ramah has some little keeps n stuff for use as brushes so if you can't draw your own you can borrow his. I think dots put the emphasis on the terrain or story or other parts of a map while stylized drawings help to capture the imagination. So you choose, can't go wrong either way really.