Final answer:
The postcards image contains a trumpery fillagree card-rack and the use of crayons in the artwork, as well as a landscape with shrubs, grass, trees, and mountains.
Step-by-step explanation:
In the image, there are several interesting details in the postcards image. One detail is the trumpery fillagree card-rack that hangs by a dirty blue ribbon. It has compartments that hold several visiting cards and a torn letter with a large black seal bearing the D-cipher.
Another interesting detail is the use of crayons in the artwork, which shows the artist's desire to return to working with bright colors. Additionally, there is a landscape depicted with shrubs, dormant grass, trees, and mountains in the background.