Socks just what purpose does the wall to the island accomplish,for example is this a roadway also because there is some important resource on the island? It is still essentially open to all sides, therefore no real protection is afforded, military docks or not. It seems to me that the wall you've established around the city is for protection from the land side? I think feanaaro's advice about opening the river mouth up some will help the layout appearance some. As you are using pencil / paper do some overlay sketches to explore the possiblities of developing different ideas. I think you can detach the sandbar from the land mass, for one use a different line style to create the sandbar this will help define water areas also. Is this a lake city / ocean port?