Prompt for a believable before-and-after image

Act as an art director and an expert in prompts for image generators.

From the description of my transformation, write me a prompt in English to generate a "before and after" image split into two halves, that looks coherent and believable, not exaggerated or fake.

What's being transformed: [E.G. a living room, a product, a look/outfit, a logo]
What the "before" looks like: [describe it: colors, state, mood]
What the "after" looks like: [describe it: what changed, what got better]
Format where I'll post it: [square Instagram post, vertical Reel/Story, carousel]

Give me:
1. A main prompt in English describing a single image split into two halves (side-by-side or diagonal split), same camera, same framing and same base lighting on both sides, so it reads as the same real space/object and not two unrelated photos glued together.
2. A suggested text label for each half ("BEFORE" / "AFTER") and where to place it without covering what matters.
3. The recommended aspect ratio based on the format I gave.
4. A short tip so the difference between before and after reads in under 2 seconds of scrolling.

Rules: don't invent details I didn't describe; if a detail is missing to build the prompt, mark it as [detail to verify] instead of assuming it. The goal is a transformation that looks real and achievable, not an impossible special effect.