I first painted the green, then masked with some sticky paste (a yellow blue tack ?)...
painted the sand, then masked...
painted the earth color !
I also painted the white stripes.
I airbrushed some buff to bring the colors together.
The earth and dust are made with pigments. I baught them in an art store, they are much cheaper than those sold by model companies.
I still have a lot to do : work on details, tracks... add a load, a figure... a base...

