I have been following one of the tutorials on creating a artistic map and wanted to added a desert to the map I created. I couldn't find a hand drawn map tutorial for this.

This is what I have so far:
Click image for larger version. 

Name:	Crownlost Artistic Map.png 
Views:	6107 
Size:	3.54 MB 
ID:	54168

does anyone have any tips to improve the desert region?