Hey guys, I'm Nabi, good to meet you!
I stumbled in here looking for some sage advice on how best to fix up this map, using photoshop 7, in order to add Mountain ranges, desert, color, etc.
Ideally, I'd like to have a range along the South and East coast of the NW continent, one along the Northern coast of the South Eastern continent, and possibly some scattered ranges in the east. Most importantly, I need a desert on the SE continent, under the rain shadow. Something nice and big.

Thanks for whatever help you see fit to give!Click image for larger version. 

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