He kindof reminds me of Nicholson's Joker in the altered pic.
Personally though, I think I'd like Joker to not looks so intimidating and scary on the surface. If he is to be an opposite to Batman, he shouldn't look so scary on the surface.
Batman uses a typically evil look to fight crime and evil. Joker uses a look associated with something more upbeat for evil purposes.
My idea is to have it so Joker's accident leaves him monstrous looking, but he then gets plastic surgery or uses makeup to hide his more hideous side. Basically, after the accident he looks like some sortof monstrous demon clown, with the green hair, pale skin, and red lips, but it's a bit more realistic in that it's not totally neat. He uses plastic surgery, makeup, etc to perfect the clown look.