Every portrait that is painted with feeling is a portrait of the artist, not of the sitter. The sitter is merely the accident, the occasion. It is not he who is revealed by the painter; it is rather the painter who, on the coloured canvas, reveals himself.
– Oscar Wilde
The Picture of Dorian Gray, Chapter 1. Basil is speaking to Lord Henry about his portrait of Dorian Gray, a young man he is obsessed with. He claims that the painting says more about the artist than his sitter. So the picture is more a reflection of Basil than it is of Dorian, expressing his homoerotic attraction to Dorian.