Tove Jansson used to change some of the illustrations and texts for different editions and language versions of her Moomin books. By reading the different versions of the books it can easily be seen how the Moomin characters have changed and developed over the decades. In the first Moomin books the Moomins have for example narrower nose as the same characters in the later editions or books.
As an example here is one picture from the book Comet in Moominland from the years 1946, 1951, 1968.
Read also: