Here is the back of the seated skeleton joker above. It's convenient that it includes the date (copyright 2008) and URL: Alchemy1977.com (Sadly it's not a working site right now but I intend to check it out on the waybackmachine)
I'll list some others here but mostly, I will not repeat the other devilish and mystical joker joker post from early 2018. Go there for more detailed write-ups of my best scary jokers!
Here are the seven pages of deathly mystical jokers.
For more info on the first image in the top left below, it is Jewish Dybbuk image made by Arthur Szyk. He was a great American artist of the 1930s-50s, A dybbuk in Jewish or Kabalistic mythology is a malicious possessing spirit believed to be the dislocated soul of a dead person. I have an article about Arthur Szyk and his card designs on this site and more about him on the original mystical joker article.
This next two sets cover the pirate section of the collection. I can imagine a day in the not too distant future when I divide this section into subsections of pirates, skulls, mystical.
The joker in the top left of the page below is derivative of a famous enigmatic painting by Jan Matejko in 1862. There's an interesting section about this in the article on death and deadly jokers.
As I mentioned, for more thrills and fun, check out the early 2018 article devilish and mystical joker jokers.