A break from the usual tropical scenes but original;) I like the comp and the lighting is a bit harsh (alot of reflection from the clear glass). Fill both the bottle and the glass with product and avoid this and make the display more appealing.
5: The comparison idea is good. The shot just seems a little flat and the reflections in the empty bottle are a bit harsh - do you have a polarising filter?
It's a catchy slogan, and the set up has potential, but the brown bottle on the right disappears into the table...needing some enhancing here to create a profile at least for the bottom half of the bottle