"Respect copyrights and only upload graphics that you have made yourself or that you are authorized to use. Any concepts that are taken from television shows, video games or any other forms of media will not be accepted. Works that are inspired by such material are only accepted under some circumstances. It is therefore encouraged that you design original ideas for your graphics to avoid any issues that may arise."

I don't see how trying to upload a head resembling an overwatch character is not against said obvious rules. Someone complained about a few weeks ago, and made a thread that was deleted.
https://img.fireden.net/v/image/1464/19/1464196269889.png (Unsupported image host)

Pretty sure they ban people from uploading, because they are sending files to the server, which get rejected several times, and they want to keep sending the same file.

Would you rather keep having to reject the same file over and over, or just not have to deal with it by removing the players' ability to upload?