Like Bernhardt, she lived in the age of photography, yet her fame resulted in a number of portraits being made of her by important artists. Below are examples.
As best I can tell from the Internet, this is a portrait of Duse by Boldini, though I could find only one source for this information.
Corcos was a leading Italian portrait painter and contemporaneous with La Duse. Her nose looks twisted, but that might not be Corcos' doing (see below).
Two images by Gordigiani, a less-known artist.
This is in the collection of Seattle's Fry Museum.
A fine drawing by Repin, who was a major Russian painter active in the late 19th century.
It seems that Duse only allowed Sargent a brief sitting, so this is little more than a sketch. More regarding what happened can be found here. Note that (1) his version of her nose agrees with Corcos', and (2) the other portraits tend to show her in profile.