It would appear that they're all images from the Tintin Poster Book, which was a large A3 size book of 21 posters, published in the 80s I think. The colour in the photos looks a little different to the images in the book, but that be a result of the lighting and your camera. It's possible somebody has taken them from the book and mounted them on board.
I believe all of the images originally came from colour plates in the black and white editions, America, Congo, Blue Lotus, Ottokar, The Black Island, etc. | 
