The Art Nouveau style was popular during the turn of the 20th century between 1890 and 1910.
The Nouveau designs included very natural ornate features. The natural items included things like flowers, plants, insects, and of course women. The style incorporated curvy uneven lines which was the opposite of the later Art Deco style.
The Art Nouveau style was used in things like paintings, furniture, jewelry, bronzes, art glass, and much more. One of the major items used in Art Nouveau items was the exaggerated long hair of the beautiful woman. It was commonly used in bronzes and paintings.