I like it.

I agree with Korash r.e. the darkness of the water and coast. Instead of that outer shadow or black outer glow around the coasts, you might try a very slight bevel or emboss instead. It'll have the effect of making your coastlines well-defined without making them look like they're 'floating'. I do like the actual color of the ocean, and I'd leave that alone. I think you just need to define your coastlines in a different way.

Have some rep for jumping right in with a map!