I'm generally not too bad at recognising people, but I think I rely on details more than on the whole face, and I can't picture faces in my mind (I'm aphantasic, so the same goes for anything else). When I've tried drawing portraits of people from life, I can draw the individual features fairly accurately, but they never seemed to fit together in a way that looks lifelike. I doubt that it's prosopagnosia, though, as my seeing seems in general to be more focused on details than on the "big picture" - I might recognise the unusual hub-caps on a friend's car but not be able to say what colour the car is, for example.
StarTrekker wrote:
I would make a terrible crime witness.
I felt very embarrassed by this when I was dealing with the police after being mugged many years ago. When they asked whether I'd got a look at his face, I knew that I must have done, as he hadn't bothered to mask himself at all. But I couldn't give them a useful description at all - about the only thing I could remember was the logo on the guy's cap (words are easy for me to remember). When the police visited me again later with some pictures of potential suspects, I politely went through them to show that I was trying, but I couldn't even say whether any of them looked more or less similar to the person I was looking for.
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When you are fighting an invisible monster, first throw a bucket of paint over it.