Just my opinion but I would look at an actual beer bottle for inspiration. Not copy it exactly but see how an actual beer bottle should be and then go from there. I think your design needs a bit more work. Its not quite there. As we say in the industry, "its half baked"
But then I really don't no the details of your rejection. So I may be wrong.
I hope that helps. 🙂
This does not look like world class commercial art.
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Get rid of the border and resubmit. I wouldn't even care about a background, if that is not an important part of the design.
To counter @Test Screen Name, build a collection of elements, using the same style. People will need probably different items in the same style, before they can use your assets.