I'm reading Oscar Wilde's The Picture of Dorian Gray, and found the phrase "what he saw in it of censure or rebuke" in the context below, difficult to understand. In particular, I don't know what relation the part of "of censure or rebuke" have to the rest of the sentence, and want to know it. I'd appreciate it if you would answer my question.
He took up from the couch the great purple-and-gold texture that covered it, and, holding it in his hands, passed behind the screen. Was the face on the canvas viler than before? It seemed to him that it was unchanged, and yet his loathing of it was intensified. Gold hair, blue eyes, and rose-red lips—they all were there. It was simply the expression that had altered. That was horrible in its cruelty. Compared to what he saw in it of censure or rebuke, how shallow Basil’s reproaches about Sibyl Vane had been!—how shallow, and of what little account!
:quoted from chapter 10 of the novel, which you can read the full text here(https://www.gutenberg.org/files/174/174-h/174-h.htm).