It's a pain when people steal our pics ... doubly so if they're using them in adevertising... what's the matter with those people? can't they take their own pics?
try writing to the offenders requesting they take down your photos... also send a note to google.
There's a ton of info (online) about steps we can take when people steal our pictures... But the only sure way to stop it from happening... is to avoid posting anything online that you don't want anyone else to steal.