You wouldn’t care if someone stole your images so it’s ok for you to steal others work images?
Regards the OP, use DMCA. I use them and have successfully had other websites shut down til images of my work are removed. I’ve also directly messaged companies asking for them to remove them. They usually do, willingly - blaming their website designer, but if they don’t Google is a great reference tool to prove they’re yours as it has records of when a page/image is first uploaded online.
You can also find out what company is hosting any website and email them, requesting removal. The usual email address for this is abuse@hostingcompanyname