I’m experimenting with bubbles and labels designed in Illustrator. Also, I don’t know how to make realistic beer foam. Any advice on that?
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You could try to play more in graph material with the opacity maps and diplasment. Nice Models
Just by adding some depth of field the rendering will improve a lot! Just making that HDRI background more blured 
And for the foam, I would try this tutorial from Will Gibbons 
https://www.youtube.com/watch?v=oVdiyVBJGKw&ab_channel=WillGibbons|3DRendering
Also, the caustics look good, but move a little bit one bottle so the shadows won’t be at the same line
Great render, the bubbles look great and delicious. Add some DoF and will be perfect.