Shared Images
Users with site-only permissions will not have access to edit Shared Images, but have the ability to use the image on their site
Shared Images
If an image is shared between multiple sites, it restricts someone with site only permissions to edit any parts of the image. You can still use the image in your content. In the Image Manager, the ‘Delete’ option will be disabled and you will not be able to click on the image to replace or change any of the details.