If you posted a photo or video to a business on Google Maps (AKA Google My Business) you have the ability to delete that photo from the business's profile.
You can also use this same method to delete reviews you left for a business, or edit the reviews you wrote.
The business owner can request a photo be removed (and there are many videos helping business owners do that) but if the photo doesn't violate Google's terms, I don't know if they will remove it.
So as a business owner, you may know the reviewer and can ask them to help. Or you can Google them. But there doesn't seem to be a way to contact them thru Google Maps.