Esther Vanhomrigh is known as "Swift's Vanessa" because of the fictional name he gave her when he published their correspondence. The portrait is wholly imaginary. No  image of Esther Vanhomrigh  survives and we  know very little about her actual appearance, although she was said "not to be a beauty".
Esther Vanhomrigh is known as "Swift's Vanessa" because Swift used this pseudonym when he published their correspondence. The portrait is entirely imaginary. There are no images of Esther Vanhomrigh, and we have limited information about her appearance; she was said not to be beautiful.