Definition of "portrait"

In portraits, the grace, and, we may add, the likeness, consists more in the general air than in the exact similitude of every feature.

a. 1792, Joshua Reynolds, Discourses on Painting and the Fine Arts

She showed me her portrait, written by herself. I only remember what she states of her mouth, which, she says, was not only beautiful and red, but had a thousand little natural airs and graces not to be found in any other mouth. Oh, I must not forget her figure, which, she assured the reader, was the best-made and the finest that could be seen: nothing could be more regular, more graceful, or more easy.

1834, L[etitia] E[lizabeth] L[andon], Francesca Carrara. […], volume I, London: Richard Bentley, […], (successor to Henry Colburn), pages 232–233

But all as in most exquisite pictures, they vse to blaze and portrait, not only the daintie lineaments or beautie, but also round about it to shadowe the rude thickets and craggy clifts

1579, Immeritô [pseudonym; Edmund Spenser], The Shepheardes Calender: […], London: […] Hugh Singleton, […]; reprinted as H[einrich] Oskar Sommer, editor, The Shepheardes Calender […], London: John C. Nimmo, […], 1890,