Do I gather it right, that these images >>120067 were sent privately but posted here "with the punitive intention to create public humiliation or character assassination out of revenge"? Sounds like revenge porn.
I also gather it was posted after a failed blackmail that happened on Discord? If this is true my advice is to report the account to Discord moderation team, that a person abusing their service, doing crimes. Frankly, all who were blackmailed by him should do this.
I'm not an arbiter, investigator, or law enforcement agent. If there is law breaking content here, please tell and I will delete.