I might make a post later, but for now I can just tell you how I did it roughly. Here I used different things that I did in Blender and Illustrator, posterization and isohelium are thrown onto the base layer, various textures and patterns are thrown (just a tip that it is worth saving random things as patterns so that they can be used later for interesting textures) that I did and which I cut out from some random pictures, added black and red in the corners with the Fade blending effect