The phrase "a single portrait of" is correct and usable in written English.
It can be used when describing a specific representation or depiction of a person, object, or concept, often in an artistic or metaphorical context.
Example: "The exhibition features a single portrait of the artist, capturing the essence of their creative spirit."
Alternatives: "a solitary depiction of" or "a unique representation of".
Until now there hasn't been a single portrait of a female former Rhodes scholar.
A single portrait of two Korean women, Young Hee Kim and Gyung-Hwa Han (1992), hangs on one wall.
It opens with a single portrait of a man dancing in an empty room, followed by a verse from Cole Porter's classic song Night and Day.
The eight films in SundanceNow's Ross McElwee Spotlight constitute (in varying degrees) a single portrait of Mr. McElwee and his families — the one he grew up with in North Carolina and the one he has created in Massachusetts, where he teaches film at Harvard.
Charles Smith played nine N.B.A. seasons, but for Knicks fans his name often conjures a single portrait of heartache: Four attempts near the basket, four rejections, a blur of red Chicago Bulls jerseys and, finally, a Knicks defeat in Game 5 of the 1993 Eastern Conference finals.
The melancholic tone of this last series is also distilled in a single portrait of Pushpamala N., one of a group shot by J. H. Thakker, famed for his studio photographs of Indian film stars of the 1950's and 60's.
The judge sat on a raised platform, and above him hung a single portrait -- that of Robert E. Lee in a Confederate uniform.
When, in 2006, he was commissioned to produce a portrait of Queen Elizabeth to hang at Tate Modern, he ended up making a series of 10, because of his belief that a single portrait cannot hope to capture the totality of a person.
He had been asked to do a single portrait, but over the course of three weeks, in a fit of inspiration, he had made at least fifteen.
By 1964 Mick Jagger has become a bit of an animal in David Bailey's single portrait of him: lips parted, eyes dead or focused on some inner need, and his face enclosed in a fur hood – fox, very likely.
Boris Kustodiev's The Bolshevik, in which a giant carrying the red banner stomps through a snowbound city, nearly treading on the tiny workers below, contains not one single portrait of a human being.
