Nicely composed -- with wonderful use of natural light.
However, as the commenters mentioned it is a bit underexposed with some of the detail on the left side of the bottle being lost. A reflector (or brightening the shadows in post-processing) helps a lot.
The only glaringly obvious 'flaw' that I would have handled differently is the tear or scratch on the bottles label, just above the 'I' in Baileys. It would be tempting to leave something like that to be cloned out in post-processing -- but when in a basic editing challenge such as this, that is not allowed. The quick and easy fix would require a couple of colored markers to paint the colors back into the tear.
As I said, an excellent study of classic composition that works nicely and fits perfectly within the challenge.
I love Bailey's.... Try Baileys, Kahlua, and vanilla ice cream blended together... just beautiful. I like this pic, and, for the most part, I like the lighting. It is a bit harsh, however, on the right which causes a dark shadow on the left. In other words, too much contrast for me. Would be nice if it were a bit softer. But overall, I really like this pic.
Great job! the shaddows at the bottom of the photo aren't that flattering, but when working with natural light, its hard to componsate! next time maybe try using a gold reflector to bounc a bit of soft light back into the bottle! good job!