Pros: Very nice idea. I do like the softer sand and it fits well with the sand clouds in the level.
Cons: You can see lines where the texture seams and repeats itself.
Improvements: Try adjusting the texture so that it seams a little better, then this will definitely have my download.
Notes: One thing that may help as well, the original Rocky Sand texture is a little more definied in the contrast. Maybe try adjusting the contrast to make the lines of the sand just a bit more defined.