I like the style quite a bit. If I had to offer a comment, it would be that the main thing my eye notices is the identical images scattered across the map. Each time you use an image, it's the same size and color, and that's something I happen to notice. I don't know if I'm weird that way or not. That doesn't mean it's a bad thing, but if it's possible to do, you might experiment with creating alternate versions of your images, either flipped, resized, or recolored, or combinations thereof. See if it improves things, or just clutters it up and/or makes it harder to work on.

Keep up the good work!