US copyright law says web-hosting companies are responsible for the copyright violation on the websites they operate. To save themselves from a penalty they should remove the web page immediately after receiving a take-down notice from you or they will be fully responsible for your copyright violation. All US-based web hosting companies prefer to quickly suspend a website than deal with a lawyer.
In this video I will show you how to find a webhosting company operating using website address.
This may help you to takedown a website that steal your photos. You can find more info on what to do when your images are stolen here: visualwatermark.com/blog/2011/07/01/your-photos-are-stolen/