Originally this was just going to be for this one photograph, but we could try to open it up to photographs for all types. Essentially, it could be a bit like Sherlock Holmes, observing things that would give insights about the persons. Whether or not it is really socionically useful, I do not know. But it may be somewhat interesting or entertaining. It is up to you to take the ball and run with it.
Here is the first photograph:
Found in the restroom of the person in question, female.