I am apparently in a very small camp here in that I personally love the Joker, he's probably my favorite villain, from his origin, to his "goofy" years, to his more recent exploits, and I also absolutley love everything I've seen about his portrayal in this film. I look forward to Nolan's take on the Joker. I want him to be dark, twisted, murderous, and over-the-top insane. I think the first image is obviously doctored, firstly. The high contrast black and white, compared with the bright red simply give it a stronger graphical impact. I guarantee if that second picture was released first, way less people, love it or hate it, would have been talking about it so much. It's not as striking, though it is much more revealing. I don't think that making the Joker darker, and more disfigured makes him a "flavor of the month horror movie villain," and I also don't think it cheapens the character. As I said in a post on another thread, no one ever said this was the "definitive Batman," nor should it be. It's Nolan's interpretation of the character, and the world, just like Batman '89 and Batman Returns were Burton's. Let's not forget that Burton's Joker was almost 100% unfaithful to the comics as far as his origin and backstory are concerned. People don't seem to like that any less.
Personally, I like both interpretations. A lot of people say things like, "Well, no one's gotten the Joker right in the last 20 years," or "No one's gotten Bruce Wayne right since the 60's," but honestly, these characters have been around so long, through so many iterations by so many creators, that there is no "right way." There's "the way I like," and "the way I don't like," but like any opinion, it can't truly be called "right," or "wrong."
Honestly, would we want to define a character like the Joker so rigidly anyway? His madcap wit, the very essence of the character, defies standards, and so long as that is present (which it thus far has been, through all we have seen), then I for one will be happy; scars, no scars, make-up, chemical bath, whatever.