Don't mean to be smart-aleckie, but you get the point. Big people will take up more room, and skinny people less, so it depends how many of each you are trying to fit in the elevator. Same thing with photos. Mainly because of color information and detail, some photos take up more space (have more data) than others to store. For example, take a photo of a black sky, then lower the camera and take a photo of a building with black sky around it, and the second photo will take more room to store. Come back in the morning and take a photo of the same building, this time with lots of beautiful puffy clouds on a blue sky, and this third photo will have even more data to store, so the file will be bigger.
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Keep it real