Many photographs of Clemenceau exist, but few painted portraits. Most of that latter that I am aware of were made by well-known artists, as can be seen below.
In some ways little more than sketch, Manet skillfully suggests the shape of Clemenceau's head and main facial features.
Nadar was a famous photographer.
Done in Carriére's distinctive style. Like the Manet portrait, this is simple, yet a convincing likeness.
The American portrait artist Johansen was commissioned to paint the Versailles Conference. That involved making a number of paintings of major men of the time. I do not know how many of these subjects actually posed for Johansen, as some of these portraits resemble previous portraits by others or earlier photographs such as are juxtaposed here. That said, Johansen's paintings show Clemenceau as being clearly older than in the photo, so perhaps he was at least able to observe and sketch Clemenceau if in fact no posing occurred.
How Clemenceau appeared when Prime Minister during the war.
Beaux was one of America's leading portrait artists. Like the works by Manet and Carrière above, this painting is more sketchy than finished.