Why was my image not accepted?

Greetings!
I tried adding a Croatian poster for Tarantino's "Inglorious Basterds" (2009) and it was rejected because it "does not meet community guidelines."
The contribution ID is #230610-102104-929002

If possible, I would like to ask someone to explain what's wrong with the image.

I am also new to IMDB so I'm still trying to get the hang of how things work here :)

Thank you!