From help:image_source
Note that providing a URL for your uploads should be preferred over all else, especially if it did not come from yourself. However, for uploads from a non-internet source (self scan, fandisc, screencap, game rip, etc.), specify what material the image came from: the work title or the episode name, for example.

@Arael Please include your source for all the images you upload. If you are uploading a self scan, a description of the material or product name would be fine. It's not okay however to leave this field blank.