We all need a little visual aid sometimes.
This wiki takes advantage of images as it deals with a visual medium. Each Sandbox Webcomic may have a Title Card whose dimensions must not exceed 600x333 pixels. Images must be appropriate for a general audience.
To an extent you may populate your entry with reference materials, but try to keep them as links rather than uploading them to the wiki. As the wiki grows this policy may be more strictly enforced.