I really like the colouration, and the layout of the land looks nice and intriguing too.

I have to agree with feanaaro, though, about the caterpillars. Clearly, as a matter of preference, it's your choice; I tend to find they look a bit mechanical, though, in these maps. Have you tried hand-drawing hatched elevations? I've tried it myself and can say that it takes a really long time but produces nice results.