Here's a few things that I might suggest, although this is a pretty good start, these are just some things to mull over. Make your rivers black, if they don't look like real rivers it doesn't matter if they're black, they will tend to blend in if black. With black rivers ya gotta make your borders thicker. As for the scrolls for the town names, dump the brown coloring and dump the curly bits...just make them flat slabs. They tend to dominate the picture.

My 2 cents