When I say there was a famous painting of the land of the dead, it has nothing to do with Grim Fandango. It was a painting based on the south american beliefs. I don't think it was abstract, and the only person off the top of my head that I know who knows about it is Godfrey Tanner, but he's dead now.
I've seen it once, it was years ago. I can't remember what it had on it. I'm not sure, but maybe many souls making a journey through trees.