Images, which are specifically used as cover image for respective series or character gallery. They serve the purpose to identify the related series or character.
2. They can be of low quality as long as they serve their purpose.
3. Character images should be well-matched whenever possible for consistent overview in "View all child tags"-mode
4. When a cover image is removed/replaced, the tag should be removed as well. The image is subject to the guidelines again and could be removed for quality reasons.