I have to admit I struggle with how much description of an image is useful; I try to describe the same aspects I would try to draw a sighted user's attention to. I confess I do sometimes try to inject a little humor but I hope in a way that is as relevant to people who need the description as people who don't.
@socalledunitedstates xkcd actually has full image descriptions, plus a text that is displayed when hovering over the image
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.