Portrait of a gentleman, possibly a member of the Bird family, half-length, in a blue coat and white waistcoat, feigned oval - Gainsborough Dupont
Self Portrait - Sir Coutts Lindsay
Portrait of the Artists Wife - Henry Herbert La Thangue
Portrait of a lady, thought to be Mary Queen of Scots (1542-1587), bust-length, in a red slashed doublet and jewelled headdress - (after) Clouet, Francois
Portrait of a Lady said to be Elizabeth Chudleigh - Thomas Gainsborough
Portrait Of A Gentleman 3 - (after) Sir Henry Raeburn
Portrait of Cardinal Bessarion 1402-72 - van Gent (Joos van Wassenhove) Joos
Portrait of a child - (after) Fragonard, Jean-Honore
Portrait of Commander Hugh Clapperton 1788-1827 1817 - Sir Henry Raeburn
Portrait of a Gentleman with a Letter - Francesco de' Rossi (see Salviati, Cecchino del)
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 
