Did you get the picture yet? I'm painting you a portrait
Jay-z is painting a picture of the end, using a song as a metaphor. He finishes the bars, gets the track mastered by Guru, then the hook plays to close it out.
This could also be a reference to Oscar Wilde’s The Picture of Dorian Gray in which the main character, a very good-looking, innocent young man sells his soul in exchange for eternal youth. His portrait endured the punishment of his sins while he remained young.
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