Inspired by @egeberkina
Copy the entire code block below.

1、Replace [REALITY SUBJECT] with a description of the small, real-world object.
-Example: a tiny sapling in a cracked plastic cup
-Example: a small ginger kitten sitting

2、Replace [MIRROR REFLECTION SUBJECT] with a description of the powerful, ideal version in the reflection.
-Example: a massive ancient oak tree with glowing leaves
-Example: a large male lion with a full mane sitting

3、Run the prompt in Midjourney. The lighting (from the right), shadows, and background (grey studio) are automatically handled.

Banana Prompt👇

A photorealistic conceptual studio photograph. [REALITY SUBJECT] is placed on a grey concrete floor, facing away from the camera, looking into a large rectangular mirror standing on the floor.

The Reflection (Physics Auto-Correction):

  • Subject: In the mirror, [MIRROR REFLECTION SUBJECT] appears in the EXACT SAME pose and position.
  • Optical Rule: The reflection is an optically correct, laterally inverted image. Gestures and limbs are perfectly symmetrical across the mirror plane (visual mirroring).
  • Environment Lock: The background inside the mirror is the EXACT SAME grey studio wall (NOT outdoors, forest, or space).

The Lighting Engine:

  • Single Light Source: Soft studio light fixed from the RIGHT.
  • Shadows: The reality subject casts a shadow to the LEFT. The reflection MUST cast a matching shadow to the LEFT on the virtual floor inside the mirror.
  • Grounding: Dark, sharp contact shadows (ambient occlusion) right under the reflection's base to ensure weight. No floating.

Details: 8k, Octane render, ray-tracing, physically based rendering, accurate mirror optics. --ar 3:4 --no forest, savanna, outer space, nature background, floating, diagonal symmetry, conflicting shadows