A lengthy (for Wikipedia) biography of Modigliani (1884-1920) is here, and the entry for Jeanne Hébuterne (1898-1920) is here. A commentary on their relationship is here.
Below are images of Jeanne.
An odd thing about Modigliani's art, at least as a Modernist, is that his female "portrait" subjects are nearly or entirely unrecognizable, and those of men not much better. This Telegraph article mentions that he would paint his subjects indirectly, combining visual memory and his feelings about them.