Only official series art works from magazines, books, DVDs, etc should be uploaded into the anime/manga/game categories.
Doujinshi publications which feature unofficial and tribute art works from anime/manga/games belong in the respective artist's category.
For example: Huke is the official creator for Black Rock Shooter. Huke's art works for Black Rock Shooter are allowed in the Black Rock Shooter category. Non-anime illustrations of Black Rock Shooter characters by other artists should be placed in the respective artist categories.
Many times, DVDs will include illustrations by guest artists. These artists have been compensated to draw illustrations for an official product for the manga/anime/video game and as such, these illustrations can go in the official category. They can be also be cross-submitted to the artist's category. This applies only for guest artists illustrating for official products. Doujinshi and unofficial art works should only be submitted to the respective artist's category.
If you're ever unsure about where to submit a scan or wallpaper, please ask an admin or moderator, we're here to help!