Mike,
You know I have an eye for the detail, so you'll know I'm being super fussy even mentioning these, but I hope I know you well enough to know that you'll appreciate them - or set me straight if I'm wrong.
The drip on the right of the glass looks to be just a bit too 'sticky'; I suspect it isn't just water - as that would have conformed to the side of the glass more, this 'sticks out' too far.
I feel the far edge of the 'sand' (at least) needs to be blurred to imply a greater distance, perhaps shoot with a wider aperture?
The shadow needs far more contrast if that's meant to be an imitation of sunlight.
I can appreciate the causes of these issues and how difficult or impossible some would be to get right in camera.
Cheers, Dave
PS
When I looked at the EXIF to discover the aperture used (f/22), I also saw the description you're holding back on 
However, I wrote the above before seeing/reading it - honest.