Portrait of a Boy with Pet Spaniel - Martin II Mytens or Meytens
Portrait of a boy - (after) Gerard Ter Borch
Portrait of a Boy - Vittore Ghislandi
Portrait of a boy, possibly Philip, 7th Earl of Pembroke (1652-1683), full-length, in robes of the Order of the Bath, with his hound - John Michael Wright
Portrait of a young boy, seated full-length, wearing a white tunic, a red curtain beyond - (after) Kneller, Sir Godfrey
Portrait of Margaret Pheasant and her Mother, 1619 - Paulus Van Somer
Portrait Of Thomas Knyvett Richmond Aged Six - George Richmond
Portrait of Joannes Ruyter - Jan Anthonisz. van Ravestyn
Ritratto Di Enrico Petiti Adolescente - Cesare Tallone
Study for the portrait of a child - Mary Cassatt
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 
