I've been drawing maps as an amateur since I was 12 years old. One of my biggest challenges when designing a world map is the desert regions. I'm always happy with the look of my mountains, water, trees, towns, ect. But my Deserts just don't look right.

Here's and example of how I do Mountains Vs. Dunes:
(IMAGE DISCLAIMER: It's A quick draft i made at work to show an example)
Click image for larger version. 

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I try to make little dunes but you see what I mean it doesn't have the right Individual Feel to it.

Any tips or tricks I should implement when drawing Deserts?