Hello Sunseeker01,
I know that if I saw what you describe, I would want more information as well. When you say ghost do you mean like pack man enemies/casper or a silhouette of a person where your picture was?
If it is the latter, then it is possible you have done an update and are using a photo as your login pic and your computer does not have access. You may have to log in and open photos or grant permissions. You may also have filevault turned on and removed the user that initially turned it on. There are a few reasons why that happens to be honest.
If it is the former, someone may be pulling a joke on you.
Can you provide a picture?
Thank you
Mikel S.