Well done mate, I have been working on my Joker bust for over a year now and keep tearing it down and redoing it, it's a labour of love.
I am not trying to get a screen accurate version or anything (I think that is practically impossible) but am definitely attempting to get the look that Heath had on his face, problem is that every photo of him looks different, so I am kind of going for my own look but hopefully looking a bit like Heath in the process.
Good work for your second sculpture, mine is my first!