In the mirror, not me. Terrifying.
Sure. 'Darkness. Footsteps. Then silence.'
A sense of the unknown. Consider 'Fog. Whispers. Unseen danger.' The fog obscures vision, and the whispers suggest something that is not clearly defined. The unseen danger creates a feeling of unease because our imagination can run wild thinking about what that danger might be.
Stranded. Alone. Then, a rescue.
Sure. 'Silk dress, his eager eyes.'
There was this black coffee scary story where a woman received a mysterious package of black coffee beans. She decided to brew a cup. As she drank it, she felt a strange coldness spreading through her body. Every time she took a sip, she saw visions of a past life where she was involved in a dark ritual. The more she drank the black coffee, the more vivid and terrifying the visions became, until she was completely consumed by fear.
One example could be a story where a man wakes up on a Sunday morning and goes for a walk in the park. As he's walking, he notices a strange mist that seems to be following him. Every time he tries to get away from it, it gets closer. He starts to run, but the mist engulfs him, and suddenly he finds himself in a different place, like a dark forest. He hears strange howls and sees eyes peering at him from the bushes.