Looking pretty good.  Sand can be a difficult thing to simulate.  God idea
trying some SSS with it.

A few things you can try too.
-as stated before, maybe don't use a uniform colour, but have a patterned
varition as real sand tends to be
-maybe try different normal types: instead of granite or bumps, you may get
better result using either a solid crackle, or cells pattern.  This will give
you flat surfaces with varying normals, and sharp transitions betwen rather
than the continuous transitions of other types.  You can also colour (or
texture) map in cordination with the pattern used.  You may need good AA though
to get nice results.

keep up the good work.

-tgq

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