Despite their size why do some boobs appeared a lot bigger than others?

https://worldpopulationreview.com/country-rankings/breast-size-by-country

according to the source above the average bra size in America is DD cups and I'm not surprised. pretty sure obesity may play a role in this. however is too bad I can't upload naked pictures of them but the women below are DD and D cups themselves yet their boobs look like torpedos when they are naked.

Despite their size why do some boobs appeared a lot bigger than others?

in case you want to see for yourself the one on the left is obviously Anna Nicole Smith and the right one is Julie Strain. anyways I just think its crazy how some women appear like they dont have a lot but suddenly look like they balloon themselves once they come out their shirts and bras

Despite their size why do some boobs appeared a lot bigger than others?
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