Funny, I think the second one works better!
In the second pic the implication is that the glass is about to leave the picture. I know its not moving, but the "tail" provided by the shadow could be interpreted as a line of motion. For me its more satisfying in the second image.
Also, the images are different because in one the glass is half empty and in the other its half full ;-) Snatch the pebble from my hand, Grasshopper.
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