Ah… searching for more pics led to this - http://cdn.moviestillsdb.com/sm/ba5c5aacb00c284692aa349bb8006836/star-wars.jpg
I’d say this is an ideal image for the Tatooine desert/R2-D2/C-3PO colors and the skin tones (though they are hard to see they are reddish and consistent with the blistering temps in Tunesia).
The problem is that the Tatooine desert has a different color depending on location, time of day, and weather conditions, and can range from more yellow, more red and brown. I’ve watched hundreds of production photos, and there’s something unique in all of them.