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Pedantry: the image seems to have been taken from an older cover of "Martine vive la rentrée"

https://www.casterman.com/Jeunesse/Catalogue/vive-la-rentree...

EDIT: for a short course in contemporary french slang, one could do worse than https://www.google.com/search?q=martine+parodie&udm=2

(my favourite being "Martine and her parodies")