This is one of several Mastroianni postcards I have listed. I'm a fan of his, in case you haven't noticed. His style is distinctive and was imitated by others. An Italian artist, Domenico Mastroianni (1876-1962) lived in Paris at one time, taking advantage of the postcard craze. He was a prolific artist, often creating, photographing, destroying and starting over on a clay panel all in one day.
In this blue monochrome, we have the necessary elements of Art Nouveau: the circle and the flow! A woman accepts a bouquet of flowers from two puttoes. Though apart, they are entwined in flowing, curving fabric. Some of the roses from the bouquet fall down the edge of the wall.
This card is artist signed and also has Alfred Noyer's distinctive logo; he was a well established Paris photographer whose business started at the turn of the century and lasted into the 1940s.
Verso, this card has been written on, but someone erased the message sometime in the intervening century. Size: about 3.5 by 5.5 inches. Signs of age around the edges but overall, in fine vintage condition.