How often can a carpenter really do this? What if most of his clients won't allow him to take pictures? And certainly most won't allow strangers to come in and fondle the furniture.
It's not uncommon for a contractor or architect to take pictures of a building after it's completed to use in their marketing material. It's pretty standard unless the client requests that they don't.
Few years back, had a knock on the door. Dude was there, said that he built our staircase, and could he take a couple pictures. It was a massive open log staircase, it was pretty cool. Filled us in on where the wood was from (local).