resized, fixed levels, upped contrast, unsharp masked, hue/saturation and neat image. (later edit) changed mode to LAB, altered the a and b channels using noise median to get rid of noise. This was done to the entire photograph. I could not get rid of all the noise but it did make a vast improvement.
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Don't like the off centre composition here, also think maybye either showing the whole glass or zooming in a little more to eliminate a bit more of the stem and show more detail in the bubbles would be better too.
I do like the lighting and the great background too.