Panorama of Hell, Jigoku no Komoriuta Recommendations
Both manga are created by Hideshi Hino, so they have similar art and plot points. "Panorama of Hell" is similar to some of the works in "Jigoku no Komoriuta", especially the first and the fourth. They both focus on a main character who is an artist, whose works are macabre and bizarre. Both manga have unflinching imagery of gore and other disturbing elements, as well as similar mood and atmosphere.