Well. Most of the time it doesn't do any good, so you could certainly rethink the concept of punishment and explore whether there aren't better and more sensible options.
Unless, of course, it's fun for both the punisher and the punished...
You know how long I had to wait until Susi finally opened up to me and in the photo sessions. And for making me wait so long "suffering", I also made her suffer a (little) bit.
In this case, I have to say that the punishment was indeed effective, even if I don't have any pictures of the far-reaching consequences (yet?)... I hope and believe that I will be able to show much more in later series. But for now, here's what laid the groundwork for more, more than I had imagined :-)
B.t.w.: For these shots, I set up the camera on a small tripod on the table and triggered it with the phone app - that's why you see me with the phone in many of the photos, and not because I urgently needed to check Instagram during the game. Come to think of it, I could apply this punishment to two or three other girls whose cell phone has almost become a part of their body :-)