Determine the perspective and composition of the scene that you want to create, with a 16:9 aspect ratio and a flat viewing angle. Use dark tones such as black, dark red, or deep purple to emphasize the dark atmosphere. You can use contrast between light and shadow to enhance the effect. Add some dark elements to the picture, such as shadows, tombstones, spider webs, etc., to create a creepy atmosphere. Consider adding some candles, torches, or other light sources to the picture to make it more three-dimensional and realistic. Pay attention to details such as textures on stones, walls, books, cups, etc., which can help create a realistic scene. Finally, you can add some ghosts, monsters, or other creepy creatures to create a scary atmosphere.