The only thing I think you could do is add the ole "important places" markers with a legend/key. I like the water as is if you intend for people to write stuff on it. You could do some light shading to enhance elevation but not real important. I'm with Goblyn there, it looks very rigid and not very organic. It looks planned out instead of natural growth of a city. To fix that all you need is a few more angular streets and some curvy streets.