Personal hell is easy. Having to live with people who are self-righteous or completely shallow or compulsive liars (like Trump).
There was an interesting take on Hell in the old Twilight Zone television show. A person who was a compulsive gambler spent the afterlife in a casino where he won every time. He loved it, at first.
Another interesting take on Hell is given in Sartre’s play, No exit, which gave a demonstration of his claim that “Hell is other people”. Three people are doomed to spend eternity together. They both torment one another yet need each other for affirmation. There is a neat twist at the end, which I will not give away.
Heaven is harder to imagine. One possible scenario would be the opposite of Sartre’s view of Hell – being in a situation where people provide each other with help and support in such a way that each person would be enabled to do things that could not be done alone, something like the way a lyricist and a composer combine their talents to write songs.