The file name should be descriptive of what the image actually depicts or is used for. Long strings of numbers or gibberish constitutes bad file names. However, file names that are vague in what the image is used for are also bad. An example of this would be naming a file Kamina.jpg, when the use of the image is to highlight the cover of a chapter or an image of both Simon and Kamina. This is because it is necessary to keep images clearly separated from each other and so users can search for the image by its file name. If it has a poor file name, duplicates are likely to be uploaded.