Christian-Albrecht Jensen's Portrait of Carl Friedrich Gauss, 1840 located at the The Pushkin State Museum of Fine Arts, Moscow. Christian-Albrecht Jensen was a French artist. The Portrait of Carl Friedrich Gauss, 1840 was created around 1840 AD.
John Collier's Portrait of Charles Darwin (1809-1882) 1883 located at the National Portrait Gallery, London, UK. John Collier was a Scottish artist. The Portrait of Charles Darwin (1809-1882) 1883 was created around 1883 AD.