Self-portraits. Like a self-interview, or any kind of self-analysis, what you get depends on what you’re asking of yourself. Sometimes you don’t want to get too deep. Sometimes you have no choice if you’re honest with yourself. Like the image or act itself, it’s just a moment in time, and by no means a definitive statement.
If nothing else, it’s a good exercise in getting to know yourself, and thus others, a little better.