Portrait of a Young Girl is a small oil-on-oak panel painting by the Early Netherlandish painter Petrus Christus. It was completed towards the end of his life, between 1465 and 1470.... It marks a major stylistic advance in contemporary portraiture; the girl is set in an airy, three-dimensional, realistic setting, and stares out at the viewer with a complicated expression that is reserved, yet intelligent and alert.
It is widely regarded as one of the most exquisite portraits of the Northern Renaissance. Art historian Joel Upton described the sitter as resembling "a polished pearl, almost opalescent, lying on a cushion of black velvet." ... Its appeal lies in part in her intriguing stare, accentuated by the slight misalignment of her eyes, while the eyebrows are faintly skewed.... She looks out of the canvas in an oblique but self-aware and penetrating manner that some art historians have described as unnerving.... (https://en.wikipedia.org/wiki/Portrait_of_a_Young_Girl_(Christus))