Yeah, apart from some slightly funky rivers I think your design looks pretty solid.

Check out some of the tutorials on the site and you should get some ideas for how to refine it graphically. It's looking pretty good, though.

BTW, you're getting rep from me for that ultra-cool city map generator. It's simple but it generates pretty pleasing patterns. I like the city you did with it. Very cool and thanks for sharing that.
M