Not sure what laws there are against public shaming. However I fail to see how even a public defender could not get you off for posting pictures of "artwork" the man has already displayed on public media and properly ascribing them to him.
The "skippy" video btw is a fake, from an unrelated case of child abuse, over 10 years old, been circulating for quite some time, thats my understanding.
That having been said, I think his "artwork" is absoluteley degenerate, and certainly grounds for further investigation. As a parent I say this,
there is no way any "normal" person could look at that "artwork" and not see its degeneracy, or not understand its intended meaning.
in canada, and I imagine Norway is the same, the truth remains a defence in slander and libel proceedings, ie if what you are saying is true, its not slander or libel
also I repeat the point that Pedosta has already himself, publicly shared this "artwork" on his own social media, and through interviews, the "artist" herself has also defended it publicly
so my arguement would be in your defence, that these people cannot be "shamed" by something they themselves have already publicly stated they are not ashamed of
the poster/flyers should leave the question open ended:
ie
"This is artwork that hangs in Mr. Podesta's home .......
the picture/art
What do you think of it?"
in doing so you can argue that you have not made any judgement with regards to the work in question, and that if people feel it is degenerate, then they have arrived at that conclusion by thier own cognizance, you in effect merely displayed something already shared publicly, and left it to the viewers discretion