If you have messaged them and they have refused to remove them there is really nothing you can do. It is not against eBay policy. From the Images, videos and text policy page:
What should I do if my image, video or text is being used by another seller?
When you create listings you give eBay and its customers permission, through our User Agreement, to use your images, videos and product details. Your content may be added to the eBay product catalog, and may be used by other sellers in their eBay listings.
You may contact the seller and ask them to remove your image or text if it is not part of the eBay product catalog.
lisa5768
Mentor2 years ago@stescha_4853
If you have messaged them and they have refused to remove them there is really nothing you can do. It is not against eBay policy. From the Images, videos and text policy page:
What should I do if my image, video or text is being used by another seller?
When you create listings you give eBay and its customers permission, through our User Agreement, to use your images, videos and product details. Your content may be added to the eBay product catalog, and may be used by other sellers in their eBay listings.
You may contact the seller and ask them to remove your image or text if it is not part of the eBay product catalog.
https://www.ebay.com/help/policies/listing-policies/images-videos-text-policy?id=4240&st=3&pos=4&query=Images%2C%20videos%20and%20text%20policy&intent=photos&lucenceai=lucenceai&docId=HELP1242