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Show your aesthetics skills and turn this ugly duckling into a rabid, flesh-eating swan of doom!
There is a lot of work to be done. For instance, look at all those different cliff types. You'll probably want to change them:
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It's as easy as selecting the "same height terrain" tool and picking a cliff type, then tapping next to a cliff you want to change.
SC2Mapster is full of mapping resources! Look in the forums, the Wiki for references and tutorials, and ask around. The mappers here are awesome. :)