As I remember the novel, this is a pretty faithful rendering. The original story covers a greater span of time - explicitly something like 20 years - or enough for Dorian's continued youthfulness to become apparent. I'm sure there are a lot of changes but the only thing which struck me was the scene in which Dorian states that he would sell his soul to the devil if only the picture would age while he remained the same... And the picture then falls to the floor. This seems unnecessarily obvious.
Dorian's cruel breakup with Sybil Vane is as well motivated as it was in the novel although the reason is different in this version.
Pretty good overall.