"Sketch for a Portrait of Brancusi," on the back of study for "the Cellist"
1909
oil on canvas
73 x 60 cm

From WhoisModi:

"Brancusi met Modigliani in 1908 through their mutual supporter, Dr. Paul Alexandre. Brancusi taught the Italian how to make sculpture and it became Modigliani's primary medium for the next five years."