Themes
1) Dorian Gray's image reflects his conscience and his true self, and serves as a mirror of his soul. The fear that Dorian expresses when viewing the painting, and the emotions that he seeks to escape through sin, drug addiction, and even murder, might be considered an expression of his anger at laying eyes upon his true self. (acceptance) destroyed by himself
2) Dorian's physical beauty is his most cherished attribute, and vanity is, as a consequence. Once he has realised the value of his beauty(helped by Lord Henry). all of Dorian's actions, from his wish for undying youth at the beginning of the novel to his desperate attempt to destroy the portrait at the end, are motivated by vanity.
3) many of the novel's characters are greatly concerned with their reputations. Lord Henry and Basil Hallward both teach Dorian on how to best preserve his good status in the public eye. When crimes are committed, it is not personal absolution that anyone is concerned with, but whether or not the guilty party will be held responsible by the public. The portrait is a literal visualization of Dorian's private self, the state of his soul, while Dorian himself looks perpetually young, beautiful, and innocent.
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