Not bad. Two things, one major, one minor.
a) the mountains need work. There is no texture to them. It looks like you missed the bump map the mountain shape process over a cloud step. I would also suggest you take a look at RobA's other tutorial for drawing top down mountains as I think with some work this produces far superior results. Also, be on the lookout as Rob as posted some teasers for top town mountain techniques that are really cool and I assume he will share when his time permits.
b) You may also want to think about adding a bit more jaggedness to the coast line. As it stands now, it is pretty smooth. This is not a major thing, so you could live without doing this, but it would add a bit more to the map.