I was just about to make a joke based on your pipe image, and then I rolled my cursor over the picture, and you'd got there first...!
mct16:
If it was published in a regular newspaper then I should think they received permission for it.
They should, but it's often not the case, especially when they use images from the internet that don't come from official sources - they bank on the little person not wanting, or being able, to make a fuss, as it might get them into bother too. In cases where they have swiped someone's original photos, I also know of papers trying to use a spurious "If it's on the net, it's in the public domain!" defence (which is nonsense, and they know it).
mct16:
Tintin magazine itself often published pastiches of Tintin, which would have been with Hergé's approval
I've heard stories of the
Tintin magazine doing this, and believed it too, but have never in fact come across any issue with fan-art in, so "often" is definitely too much, and it may in fact be "almost never/ never".
Whether or not it would have been with Hergé's approval would also be open to investigation: Raymond Leblanc's rights to use and promote Tintin for the benefit of his company were probably built into the agreement he signed with Hergé, and he was undoubtedly in the upper position in that arrangement, as Hergé's continued well-being and livelihood were at stake, and he pretty much will have had to agree to what Leblanc wanted.