Troubleshooting
Common Nano Banana failures & how to fix them
When generations miss the brief, the cause is usually the prompt—not the model. Use the symptom list below: each item explains why it failed, gives a copy-ready fix prompt, and recommends Nano Banana or Pro.
Symptom checklist
Identity drift (face / character changes)
Recommended model: Nano Banana ProWhy it fails
The prompt restates appearance loosely or asks for a new “style” without locking identity. Without identity anchors, the model invents a new face.
Fix prompt (copy-ready)
Keep the same person identity from the reference: same face structure, age, skin tone, and hair. Only change 【outfit / background / pose】. Do not redesign the face. Maintain identity lock across the edit.
Blurry or garbled in-image text
Recommended model: Nano Banana ProWhy it fails
Typography needs explicit wording, placement, and contrast. Vague “add a title” leaves letter shapes under-constrained.
Fix prompt (copy-ready)
Add clean, sharp typography that reads exactly: “【YOUR TEXT】”. Place it 【top-center / lower-third】 on a high-contrast area. Straight baseline, even kerning, no warped letters, no extra glyphs.
Lighting / shadow mismatch after edit
Recommended model: Nano Banana / ProWhy it fails
Edits that change materials or time of day without matching light direction create plastic highlights and floating shadows.
Fix prompt (copy-ready)
Match the existing scene lighting: same key-light direction, color temperature, and shadow softness. New elements must share the same light and cast consistent shadows. No conflicting rim lights.
Background not cleanly cut / halo edges
Recommended model: Nano BananaWhy it fails
Prompts that only say “remove background” without edge and fill instructions leave fringing, hair halos, or uneven fill.
Fix prompt (copy-ready)
Remove the background cleanly with crisp subject edges (especially hair). Replace with a seamless 【solid color / soft studio gradient】. No halos, no leftover clutter, subject fully preserved.
Over-smoothing / plastic skin
Recommended model: Nano Banana / ProWhy it fails
Beauty or “enhance” prompts without texture constraints push toward porcelain skin and lost pores/fabric detail.
Fix prompt (copy-ready)
Enhance clarity without plastic skin. Keep natural skin texture, pores, and fabric detail. Mild polish only—no heavy airbrush, no waxy highlights, no oversharpened edges.
FAQ
Should I always use Nano Banana Pro for fixes?
Use Pro when identity lock or sharp in-image text matters. Standard Nano Banana is enough for many background and lighting fixes. Start with the recommended model on each symptom card.
Can I paste these fix prompts into the create app?
Yes. Copy a fix prompt, replace the 【placeholders】, and run it in the Nano Banana create app with your reference image when needed.
Where can I see more failure examples?
Read the blog post on common failures and fixes, then browse the showcase and prompt guide for working patterns.