Deletion of Posters

Hey there! I hope someone from the IMDB team can assist? I urgently need to delete posters and replace them with new artwork for the following two titles for the official distribution company of these films:

Margarine:

https://www.imdb.com/title/tt15249740/

A Lucky Man 

https://www.imdb.com/title/tt2061853/

Would really appreciate it if you can help!

Thanks so much.