To dream that you are taking a mugshot represents a sense of permanent embarrassment or being remembered negatively. It may also reflect feelings of never being able to be trusted ever again. Alternatively, it may reflect feelings of never being able to get away with something ever again. Facing up to responsibilities or mistakes.
To dream of looking at recent mugshots represents memories or reminders about why you or someone else can’t be trusted. Probable suspicions.
To look at old may reflect memories of something stupid you did or past immaturity. Remembering a time when you or someone else didn’t think about what they were doing. A past embarrassment.