When I see spirits or anyone in my family does (also others that I know are clairvoyant) we only really ever see the faces/portraits of a person.
And maybe the spirit got attached to you, or you unconsciously called someone forward? I would suggest trying to speak to it, maybe figure out what it wants from you?
I don't think it signifies anything in particular, just that it's either attached to you for some reason or that it wants something you can provide. Either way, you can wait it out, maybe it will go away, or you can try to cleanse and banish maybe? OR talk to it and help it with whatever it is it wants.