are there any famous art nouveau artists who liked including dragonflies(and leaves) in their designs?

Answer 1

If I recall there are some hidden dragonflies in the works of Chagall

Answer 2

The dragonfly was an especially popular art nouveau motif, a favorite of Lalique, Louis Comfort Tiffany, and Émile Gallé, all of whom would have seen examples in Japanese art. Probably its popularity in France grew after translation of a series of Japanese poems (Judith Gautier, Poëmes de la libellule [Poems of the Dragonfly], 1885).
http://www.nga.gov/education/tchan_5_04.htm

In jewellry
René Lalique
French (1860-1945)
Dragonfly woman corsage ornament, c. 1897-1898
gold, enamel, chrysoprase, moonstones, and diamonds
http://www.nga.gov/feature/nouveau/exhibit_audio.htm#

Answer 3

Louis Comfort Tiffany used both leaves and dragon flies in his glass work. We were to a special exbition of his work recently and saw a the beautiful Lamp with Dragonfly Motif(1900-1910). Also saw the Lotus Lamp(c. 1900). Those are two specific works that we saw but I believe leaves, dragon flies, flowers, water...nature in general were among his favorite designs.

Answer 4

Try Emile Galle http://perso.orange.fr/artnouveau/en/artistes/galle.htm