What I think so far

I am becoming fascinated with the story of Dorian Gray. I have gotten to the end of chapter 11, on page 93, and for a few chapters now, things are taking a turn for the worse in his life. However, this is his own fault, as his personality is becoming more and more cynical and much less innocent and pure. Firstly, I think the concept of a portrait taking the damages and ugliness of age and stress while the real face of the person remains pure and beautiful is very interesting and genius. The fact that people will dismiss the allegations and scandals surrounding Dorian simply because he looks innocent brings up an issue in society today. People will treat people differently simply because of the way that they look. People will refuse to believe that an innocent, young girl-looking girl could do anything wrong, but will immediately believe the first thing they hear about a disheveled woman. I was watching a show called "Brain Games" where people were much more willing to help a woman who was dressed nicely when she fell than one that was dressed poorly and has messy hair. I believe that Oscar Wilde touches upon this issue with a perfect analogy using the portrait.
Dorian's change in character was triggered right before Sibyl Vane's suicide, which is what likely caused this tragedy. His lack of care for the death of his fiancee is extremely concerning, but only Basil seems to notice. I believe Basil is very intelligent and knows Dorian better than anybody else (which is likely why he was the first character introduced to the reader, he is very important). His importance to the story should be emphasized in the coming chapters.
Dorian is now becoming obsessed with this yellow book that Harry gave him. This is a negative influence, though, much like the portrait. Dorian uses the portrait as an excuse to act cruelly, as all of his ugliness is shown in the portrait, which he locked away in an abandoned room. Thus, nobody will ever see his true colors (except Basil, who I think is the only person capable of this. He is also the only other person to witness the painting after it began aging). Basil mentioned Harry being a poor influence early on, and I think this yellow book will prove it. it is interesting, though, because the catalyst for this misbehavior, the portrait, is from Basil himself. Dorian, though, made the "deal with the devil" to portray all of his age on the portrait. Thus to no fault of his own, Basil's beautiful painting is ruined, and is ruining a beautiful man and personality. I feel bad for Basil, as he lost his great friend in Dorian, but now Dorian's true values (beauty, purity, being liked) and selfishness are showing. It may have only taken wise words from Harry, or perhaps a mystical force within the portrait or book, but Dorian's true personality is presenting its ugly face, but nobody can see that.