This beautifully flowing lithograph was by the Hungarian (or possible Ukrainian) artist Margit Gaál. Very little is known about her except that she was born in 1898. This picture came from a limited edition of 100 signed lithographs published in Paris in 1920 called Songes Galantes. This picture, Danse Galantes, was the last of the twelve pictures in the work.
It's not clear at first as to the sex of the standing figure, who has masculine clothes and short hair but the curves of the figure and the dainty feet suggest it is a girl; perhaps one of the tribades that were fashionable in Paris at this time.
Whatever, it is a striking composition full of energetic abandon.