Coloring is a little off to me. It looks great as a thumbnail but when magnified in the color is, for lack of a better word, dull. If you use Adobe Photoshop, you can mess with the levels of each color range to make it pop more.

Also, the outer glow of red, for black lettering makes it a bit dull as well. Potentially, if you use adobe illustrator, you can expand the lettering to make them pop and apply gradients. Black and red, although great together, does not necessarily apply to your maps color palette.