Or... you might want to check out the thread in the Mapping Elements section that Fluesopp started called "Automatic Forester."
It's not perfect yet but is pretty damn good. I know Fluesopp is rewriting it from the ground up and I am currently working on his original version to try and improve the look of the forests when they are packed in real tightly. But there are working versions already in the thread.

As to your map... I really like it. I love how you've done the sea with the crumples suggesting the waves. It looks great. I also like your texture work on the land too. Really looking forward to watching this progress further.
Well done.