Azumanga Daioh needs poster as primary image

https://www.imdb.com/title/tt0339955/?ref_=ttmi_tt Azumanga Daioh does not have the correct poster for its primary image. I attempted to upload a copy of the poster that should be the primary image, but it wouldn't allow it because there is already a copy in the photo gallery. I attempted to delete the image in question saying that I am going to reupload it as a poster, but that was declined as well. This is the image that should be the primary image since the current primary is just a group shot that looks nothing like a poster.