I was playing a little with lighting here. Put small candle behind the bottle and used a lightsource reflecting from the ceiling.
Used auto levels. Increased saturation and USM. Slow shutter.
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I really like the mellow tones of this shot, your choice of topic is good for this particular challenge.
I find the background distracting, perhaps a darker or black b/g would bring the focus directly onto the topic, would also eliminate the rings on the table.
A lower point of view would have brought the top of the bottle into shot, though then you may not have captured the lovely mellow colour in the bottle. It's a difficult lighting situation, but one well worth playing round with.
I do like where you are heading with your playing round, it's so important to keep trying new things......lighting, camera angles, editing.
It would be good to try this shot again with a different background, deeper dof to see if you could get a slightly better focus on the front of the glass, adding more light to see if you could get that glass to sparkle.
I'm not a Cognac afficionado but I don't think you drink it out of that kind of a glass. And those water rings or light reflections are distracting. And the top of the bottle is cut off :(
i would have liked to see more of the amber tones played up in this photo as opposed to the reds. perhaps a black background would allow those reds and ambers to sing more in the photo. also, the light source is reflecting a lamp in your glass, and bouncing your light may help avoid this.
as an adult, i have acquired a taste for v.s.o.p. and am happy to see this tasty marker of adulthood included in this challenge!