The environments on this map are what's getting me: the fact that desert gives way to rock then to green, etc., all in straight lines and without any mingling create an unbelievable, overly simplistic zones. Also, the geography seems unrealistic to me (ex: why would a peninsula such as that be desert?); but perhaps this is a magical setting?

I think the prime value of this map is in your having created the map features (the dunes, the mountains, etc.), vs. the map itself. I do look forward to seeing your work on it, though!