On Amazon nobody holds the bottle. The shopper sees a photo the size of a postage stamp, next to ten competitors. The label is the advertisement. Here are three decisions before design starts, and seven rules for the designer.
Amazon requires the main photo to be the real product on a white background, with no added text or graphics. Everything the shopper will learn has to be printed on the pack.
The testShrink the design to one inch tall. If those three things cannot be read, it is not ready. Everything else goes on the back.
The first bad review is almost always a bottle that leaked or a pump that did not work.
Certain words turn a cosmetic into a drug, or a cleaner into a pesticide. Amazon detects them, inside images too, and removes the product.