I had to look for a while to before I could guess which way around this glasses are - top or bottom! It is an interesting set-up. You managed to avoid getting in any reflections of yourself, good!
nice focus and shadows. interesting choice of composition/cropping. i don't know if another angle/position/cropping would have been more powerful, but the setup is good and i'm not sure if you maximize its potential.
I think your composition is well done and creative, but I'd like to see more detail in the glasses, perhaps sharper focus all the way through using a smaller aperature?