because of the nature of glass, unless the glass is extremely thick and dense, when you have a liquid inside it, it looks like the liquid comes to the outer edge of the bottle, not the inside one.
the liquid inside the bottle needs some work.
did you make the glass polys double-sided, or add an 'air' layer?
I opt for air layers as these make for better refraction.
general alcohol has a refraction index of 1.392, and glass of 1.51714
I love scenes with glass and liquids because they are so effective.
btw....the caustics in the original pic look great.
~~CM!
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