Did you save the image with the .jpeg compression turned way up for some reason (the quality is similar to a low resolution .gif right now)?
Re-render the image and save it as a .png file (or if you need to use jpeg have the compression turned all the way down).
I think I had the compression set to 15%, but I worked hard to make it blurry and with artifacts. . , haha, it was too clean looking otherwise for what I had in mind. I kind of wanted people to guess a little, squint and dream their way into it. I did a lot of experimental post processing in Gimp, so I don’t really want to go through the process again. It for Apocalypse now the video game fan art, it’s supposed to be like Fallout Vegas on LSD, so thats why I didn’t want a clean perfect looking render. I got the compressed look by adding plateaus to the color curves etc.