There are a few things I would change with this style, but they are quite minor. The one thing you might want to change though - or at least consider for future maps - is the layout of you rivers. Take a look at the standard tutorial for more detailed explanations.
Also, I think you did a rather good work with the "water lines". I have been trying for ages to find ways to get these finer copperplate engraving lines right. There are a few good tuts on here for the heavier "woodcut" style lines, but nothing for these finer variant.
And finally... you don't happen to have a larger version of this map around?