Here's my latest progress. I sharpened up the mountains a bit and did a rough pass on the vegetation. I'll probably spend more time on the details like getting the forests to interact with the mountains better, adding interest to the ice caps, maybe adding some color variation to indicate tropical vs. temperate forests.

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Viking: I appreciate your critiques. Messing with the landforms and rivers is a bit more than I'm game for right now but will keep in mind for the future. The mountains were a good call, however, and I did go back and edit those.

arsheesh: That tutorial is really great. Hopefully by the end of this map I'll be able to use the techniques to create something in my own style.