Thanks guys, much appreciated!
That sandy base looks great. Care to share your process?
Basically I spread a textured paste from Vallejo
(link) on the base. Once dry, I applied a slightly diluted desert yellow paint. Then, I dabbed pigments with an old brush, mostly yellow ochre and burnt sienna, and lastly I glued some grass tufts.
Here is a video tutorial from someone who does it better than me: