E4M1 - First Gate by Karthik Abhirama Krishna


E4M5 - Delomelanicon by Pablo Dictter



E4M6 - Exidium by Pablo Dictter



E4M7 - The Gate to Hell by Varun Abhirama Krishna



E4M8 - by Tobias Muench



You can see more screenshots at Doomcenter's 9th Gate Image Gallery.