There's that barely noticable voice in my mind that tell's me to prefer this image over the other ;-)
Kidding aside, it's a nice image, for which I still would have a few suggestions.
For one, there are little brighter "splotches" on the dunes. I think that's a surface layer with a too intense fractal breakup, with too much sharpness and feature scales. I think it would look better if color variation on the dunes would be very very soft.
You might also want to try to reduce the size of the larger fake stones and also give them a little displacement.
Lastly, if you add soft shadows, that would be a nice final touch.
Oh, and it *may* help with the overall dynamics, if either the sky or the ground would be brighter than the other. For now, both sky and land are equally bright, although one would think that with so much sky and white clouds, either the ground shouls be darker or the sky slightly over-exposed.
Other than that - the cloud looks like a long awaited blessing for the dry landscape. Let's hope it won't just travel by :-)
Cheers,
Frank