I like the composition. To me the inverted face in the bead needed to be pin sharp to make it the focal point. With a sharper image and better contrast I would have rated this picture quite highly. Stronger diffused lighting and more accurate focus are all that are lacking.
Wow, awesome image. Wish it was in focus a little better and better lit (and if you got both of those spot on this image would be stellar!) Very cool though.
Neat upside down reflection in the marble, but a lot of people might miss that. The image is too dark and it's not quite in focus. Better lighting might help.
It's a good idea, but the main interest here is the image in the marble. I'd suggest zooming in on that, maybe using a vertical crop next to the eye on the left and the edge of the face on the right or even cropping to just show the marble and the eye as I'm not sure the lips really add much to the shot either. There's a lot of wasted space in your current crop.
Interesting shot, more emphasis in the reflection in the grees orb and less on the fingers in the foreground would perhaps been better suited in this challenge. Technically better attention to focus would have greatly improved this shot