Zillow: the solution is for the owners of the home to "claim" it on the site. This forum talks about how this can be done: http://www.zillow.com/advice-thread/How-to-remove-house-interior-pictures-from-ZILLOW-COM/463866/
Trulia: contact their customer service at http://www.trulia.com/help/ask/ or call 1-888-466-3501.
Redfin: the agent needs to contact their MLS, since we do not syndicate to Redfin. They can also contact Redfin at firstname.lastname@example.org.