If you broke no other laws in obtaining the photos (trespassing, safety, Airspace etc) then the photos should be fine so long as they are not deemed to be "sensitive". That's usually reserved for operative power plants, prisons, and housing etc for minors (DSS type stuff). Anything else really has no "Expectation of Privacy" from the air.
If they really want to PUSH the issue and spend the $$ then you have to decide if it's worth the $$ to push back. In the end you might win but still be out your legal fees.
If they really want to PUSH the issue and spend the $$ then you have to decide if it's worth the $$ to push back. In the end you might win but still be out your legal fees.