Auch für Bilder auf Webseiten gilt: Vermeidet doppelte Grafiken. Stichwort Duplicate Content.
Generally, the best practice is to have only one copy of any type of content. If you’re duplicating your images across multiple hostnames, our algorithms may pick one copy as the canonical copy of the image, which may not be your preferred version. This can also lead to slower crawling and indexing of your images.