How would that reflect on you? He made a clear disclaimer against any association with you. For the customer they are clearly not interacting with your business, just a person buying from you and accepting payment in Monero.

If this listing were to appear as an official listing without a clear disclaimer I understand the objection. Perhaps you've copyrighted those photos and thus you wish to claim copyright over them maybe that's the objection I could see that too but that seems to be fair use from my understanding of the law.