You can prepare relevant evidence and bring a lawsuit to the court.
Privacy is a private matter. Personal information and other things in personal life are not known to others, and have nothing to do with public interests and group interests. Others are prohibited from interfering. Privacy is a kind of personality right that natural persons enjoy to control their personal information, private activities and private fields unrelated to public interests. Sending photos of other people around you may violate privacy.
If it is for profit, it may infringe on citizens' portrait rights. If the actor infringes upon the civil rights and interests of others due to his fault, he shall bear the tort liability.
To sum up, posting photos of others on Tik Tok is an infringement of others' portrait rights or privacy rights. If the other party does this for profit, it may constitute a crime.
Legal basis:
People's Republic of China (PRC) Public Security Administration Punishment Law
Article 42
One of the following acts shall be detained for not more than five days or fined not more than five hundred yuan; If the circumstances are serious, they shall be detained for more than five days and less than ten days, and may be fined up to five hundred yuan:
(1) writing threatening letters or threatening the personal safety of others by other means;
(2) publicly insulting others or fabricating facts to slander others;
(3) fabricating facts, falsely accusing and framing others, and attempting to subject others to criminal investigation or public security administration punishment;
(4) Threatening, insulting, beating or retaliating against witnesses and their close relatives;
(5) sending obscene, insulting, intimidating or other information for many times to interfere with the normal life of others;
(six) voyeurism, sneak shots, eavesdropping, spreading the privacy of others.