Looking good! I'm curious if you've ever seen a label printed in such way that you had to look through the liquid to see it? Or your own idea?
For the last render (yellow bottle is tilted) the perspective seen on the left and right-most caps is a bit of a put off to me (but I'm on the fence somewhat)
--shift studio.
I like the composition, the colors and the lighting; very nice background, too. The black closure (or whatever you call that in English) is convincingly modeled, i. e. not too regular. And the bottles have a nice, believable form.
I have never seen some bottles with rubber around it (nor the label printed this way. But you already explained that one). Do those rubber bottles actually exist or are they your idea?
Some crits: You should look out more for the 'black stuff' in your renders. It's even there in the last one. It's not possible to get rid of it in Cheetah (only to a certain degree), but as it is, it would be quite easy to hide.
The second crit is that the bottles look empty to me.