One thing I know is that I’m much better at recalling sound than I am recalling vision, when it comes to people. I can very vividly recall someone’s voice, even the sound of their breathing. Even the way people move sounds different from person to person and I can recall that in great detail.
I have very vivid visual imagination but recalling actual detail in a real memory is difficult unless I keep focusing on individual details. With faces, I can recall someone’s eyes, nose, their skin blemishes separately but when I try to put those together in an entire face, it all becomes blurry and vague.