Well, I think that you are off to a great start

I also like the style that you are developing...sort of cartoonishy but still capable of passing on info. As long as that is where you want to go, I see nothing wrong with a non-realistic representation of coastlines. I even like those little islands...IMHO they work with the coastlines that you have already.

I would suggest that you add a bit of color to the forests and mountains, just to break them away from the land masses. not too heavy on the color either, just enough to give them some "oomph".

And for your first map in your first post, I will hit you over the head with a wet Spaghetti Noodle of Reputation....(I always have trouble telling if it is done)