Someone is put my picture in tiktok blackmail...

First, you have to consult the Qatari Ministry of the Interior in order to file a complaint about the threat, electronic extortion, and the use and publication of your personal photos.
These are crimes that are penalized by imprisonment and a fine, or at least one of the two penalties.
You can contact the concerned party in one of these tools:
Cell phone number (2347444)
 Hotline (66815757)
 Email: cccc@moi.gov.qa
Find the Qatari CyberCrime Law in regards of your inquiry:
Article (8)
A sentence of not more than three years in prison and a fine of not more than QR100,000, or either of these penalties, shall be imposed on any person who, through an information network or information technology technique, violates social values or principles, publishes news, photos or video or audio recordings related to the sanctity of people’s private or family life, even if the same is true, or insults or slanders others.  
Article (9)
A sentence of not more than three years in prison and a fine of not more than QR100,000, or either of these penalties, shall be imposed on any person who uses an information network or information technology technique to threaten or blackmail another person to have him/her do or refrain from doing a certain action.