I'm fighting the square crop on this. I really want to see the top of the bottle. Missing the bottom isn't bothering me as much. I think the background glass should be a touch more in focus. You're almost completely losing it in the backdrop. I understand that you want it out of focus, but I think you went a little too far with it.
I think the background glass draws attention to the backdrop actually, and I'm not sold on your backdrop. Bringing that glass more in focus would help define it from your cloth.
this is a nice image, although I think the concentration should have been on the glass with the whiskey, which might be a bit more subtle and lend itself more to the implication of being 'smooth as silk' instead of spelling it out literally.