I can almost taste it, and brings back a lot of memories. I think you set up the shot very well in the frame; if you had included the whole glass the viewer might not have been so quickly drawn to the main point of the image, the bubbles. Started at a 7 bumping to an 8.
Nice image and well controlled lighting on the background. I think perhaps a back-light shining through the bubbles would have helped them to have more impact. As the lighting is at the moment my eye is draw to the handle of the mug and that becomes the subject of the image. The lighting simply isn't balanced from left to right.
Nice picture of bubbles. I like the darker lighting at the top of the straw. Don't like the brown/red contrast. Perhaps a different background, or use white milk (but that probably would have lost the contrast of the bubbles' edges).