Portrait of Mary Dowdeswell, half-length, in a blue gown, feigned oval - Michael Dahl
Portrait Of Frederick V Elector Palatine And King Of Bohemia - Michiel Jansz. van Miereveld
Portrait of an Officer, half-length, in the uniform of the 32nd Lancers - (after) Hoppner, John
Portrait of a Boy said to be William Pitt The Younger 1759-1806 - Tilly Kettle
Portrait of a Man - Peter Gertner
Portrait of Urbain Cuenot - Gustave Courbet
Portrait of William Thomas Brande 1788-1866 1830 - Henry William Pickersgill
Portrait of a bearded man with a pipe in his hat, half-length - Cornelis Dusart
Portrait of Edward Fiennes de Clinton 1st Earl of Lincoln from Memoirs of the Court of Queen Elizabeth - Sarah Countess of Essex
Portrait of Father Fyodor Dubyansky, 1761 - Aleksei Antropov
Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the 
