This picture is from a Jehovah's Witness publication. This isn't a depiction of heaven, but rather a future paradise earth. And the picture depicts various people being redirected back to life.

Those are for the living, waiting to rise up.

They are dildos, for the giants.

Shit, I've see this painting in person multiple times. I think it's in one of the Manhattan museums. And I never asked any of this.

If I'm not mistaken, Buddhism had a being that was the ghost of a ghost. Yes, ghosts could die. Probably that's the case.

From Wikipedia:

Jehovah's Witnesses believe that a "little flock" of 144,000 selected humans go to heaven, but that God will resurrect the majority (the "other sheep") to a cleansed earth after Armageddon.

I feel like the presence of the headstones and the children more points to the latter belief, that God will resurrect the dead after Armageddon or whatever.

Like, God has resurrected your kid's dead grandpa, straight out of the grave, and now you're forced to deal with your shitty father-in-law for eternity

If I don't want afterlife I can just stay dead??

Maybe they ask you to accept terms at the beginning & if you refuse they just let you have your peace, one life was enough.