Nano Banana Reference Edits: Lock, Change, One Turn at a Time
NanoBanana Team · August 7, 2026 · 4 min read
The Edit Problem Nano Banana Actually Solves
People do not open Nano Banana only to invent random scenes. The high-intent job is narrower: keep a face, product, or layout stable while changing wardrobe, background, season, or mood. That is reference-based editing — and it fails the moment your prompt describes the new world without locking the old one.
This tutorial gives you a three-part discipline that works in MidassAI Studio Nano: Lock → Change → One turn. You will get four paste-ready prompt patterns for common creator jobs, plus a short failure checklist so you know when to split an edit into two passes.
The Lock → Change → One-Turn Method
1. Lock (preservation rules first)
Before you name the new background, write what must survive:
- Face geometry, age cues, freckles, hairline
- Product silhouette, logo placement, material finish
- Camera crop and subject scale when layout matters
Phrase locks as positives: “keep the same face and eye shape,” not “don’t change the person.”
2. Change (one primary variable)
Name a single primary change per turn: background, outfit, lighting grade, or prop. Secondary adjectives are fine; a second structural change is not. “Swap jacket to red wool and move to a rainy street and add two friends” is three edits pretending to be one.
3. One turn (then re-lock)
After the model returns, restate locks if you continue. Context helps, but drift creeps in when follow-ups only mention the new ask. A good turn-two prompt still begins with “Keep face, hair, and pose from the previous image…”
Edit Discipline
Four Copy-Ready Prompt Patterns
Paste into Studio Nano with your own file uploaded. Replace bracketed parts.
A. Background swap (portrait)
Using the uploaded portrait, keep the person’s face, hair, skin tone, and collar identical. Replace only the background with a soft sage seamless studio. Match existing key light direction. Do not restyle makeup or crop.
B. Outfit change (character consistency)
Using the reference character, keep face, hairstyle, body proportions, and camera angle unchanged. Change only the outfit to a charcoal utility jacket over a cream tee. Preserve fabric realism; no logo text.
C. Product into lifestyle scene
Using the uploaded product photo as the hero object, keep the bottle shape, label layout, and cap color exact. Place it on a sunlit marble vanity with a softly blurred plant in the background. Commercial lifestyle lighting, 4:5 crop.
D. Season / mood grade without redesign
Using the uploaded street photo, keep all subjects, architecture, and composition identical. Shift only the grade to late-autumn cool tones with softer contrast. Do not add or remove people or signage.
Run A–D as separate sessions when testing; do not chain unrelated jobs in one thread if you need clean rollbacks.
When Edits Break (and How to Recover)
| Symptom | Likely cause | Fix |
|---|---|---|
| Face slowly morphs | Locks omitted on turn 2+ | Restate face locks every turn |
| Product label melts | Too many scene adjectives | Shorter change line; lock label explicitly |
| Crop jumps | Unspecified framing | “Keep identical crop and subject scale” |
| Everything changes a little | Multiple structural asks | Split into two generations |
If a pass is 80% right, describe the 20% fix only. Regenerating from a brand-new paragraph often throws away the good lock.
Studio Nano Checklist Before You Hit Generate
- Reference image uploaded and selected.
- Lock sentence written first in the prompt box.
- Exactly one primary change named.
- Aspect ratio set for the destination channel.
- Previous keeper downloaded if you are about to risk a big rewrite.
Optional: steal composition ideas from Showcase on this site, then rewrite locks around your reference — never paste a gallery prompt unchanged onto a real client face without preservation language.
Practice Assignment (15 Minutes)
- Upload a clear product or portrait.
- Run pattern A or C once.
- On turn two, change only lighting or only background — not both.
- Compare identity stability. If drift appears, rewrite with stronger locks and retry.
When the loop feels boring, you are doing it right. Stable edits are repetitive on purpose.