Only thing that annoys me is that he ripped off 2000s Marilyn Manson. It should have been the 90s version. Maybe around the Mechanical Animals phase.
Honestly, it doesn't really matter. The Joker is the Joker. There's been tons of versions and there can be another. As long as he looks like a clown and does crazy shit, that should be just fine.
Plus, the one from that Batman cartoon a few years back is the worst one ever. It can't be topped. Nice try, Leto.