Directive 2011/92/EU article 5.2 would suggest no less than 1 year of imprisonment. Depending on how kindly you read the other articles, and given how much pornography instances he had, I'd argue for more.
Even ignoring all this, Directives do not themselves automatically become enforceable in member State's legal systems either - "Regulations" do, and this is not one, the trial will be conducted subject to Danish criminal law.
Hmm… “DIRECTIVE 2011/92/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 13 December 2011, on combating the sexual abuse and sexual exploitation of children and child pornography, and
replacing Council Framework Decision 2004/68/JHA”
I wonder if made a mistake, but that's the one I had open. I understand it doesn't impose specific penal choices, but I still think the punishment was fairly lenient.