Yes, the law is clear if it is within this framework
If your use qualifies as a fair use, then it would not be considered an infringement.
And using the image as an avatar for that account is it allowed to do that?
I know you know a lot about this when it comes to copying other works or pictures
RE: When some witnesses and others give their voice / upvote to an account that uses a photo for another person and even his name "Justin Sun"