I don't dislike the sculpt personally.
Is it up there with the best? No.
But it's a good looking representation. It's unmistakably Ledger. I like it in the same manner that I like an Inart Joker, irrespective to realism and accuracy, or any other custom.
I'll tear down that Inart figure top to bottom. But I can still appreciate it separately if that makes sense.
This screams Hit Me!
Give it more hunch.
Shoulders up, head looking down, a few swaps here and there, and some good posing...
And this thing will shine!