Of course, appearances can be deceptive. For all the knitters know, the kittens could be thinking about pursuing small native animals prior to capturing them and torturing them; the puppies, about ripping the entrails out of the stomach of a dead enemy; the children, about how to build an atomic weapon to take over the world; and the men, about what's on the telly tonight. Which would rather go against the enforced jocularity of the whole scene.
But all that should just go to show, you can't judge a cover by its book. Or maybe, judge not lest ye yourself wear a cosy jumper on the cover of a knitting magazine and are judged. Or possibly, a kiss without an egg is like a moustache without salt. Who can tell?
Cosy jumpers. Don't mess with them.