For example, taking pictures of our dinning room made me realize that the pictures are hung too high. It wasn't obvious to me at first because I'm tall (right around 6'). Eye-level to me may be 4 or 5 inches too high. Another example was in our living room window treatments. I always liked my sheer, off-white curtains until I saw the photos. The windows were screaming for window treatments with color.
Maybe this explains why I prefer my picture not be taken.