The following is the psychological explanation of dreaming about portraits:
As for the dream of "portrait", there are usually "portrait", "spirit card" and "stranger" in this dream. Psychologically speaking, "portrait" generally represents one's impression in others' eyes, "spirit tablet" represents one's merits, and "stranger" in the dream represents one's unknown personality level. Dreams with "portraits" show that dreamers sometimes feel ambivalent about themselves and want to know their true selves again.