@amartinuzzi wrote:

See subject line.

File a report!

For example:
https://www.themoviedb.org/movie/31058-riso-amaro/images/backdrops

Go to the menu "Overview".
Select "Report".
A window opens.
Select "Bad Image".
Write a short comment like:

"I want to delete this backdrop:
https://media.themoviedb.org/t/p/original/yqLujYxyBYwx3M1rPxcqix9AsQW.jpg"

Select "Public" or "Private" (all users can see the report vs. only moderators can see the report)
Click on "Submit"

Reports end up here:
https://www.themoviedb.org/talk/category/504794a319c29527aa000640

Moderators can look at it and do something about it - when they find the time.
I found time and deleted the backdrop:
https://www.themoviedb.org/movie/31058-riso-amaro/images/backdrops

I hope that's what you wanted to delete...