I think Nano Banana Pro should have passed your giraffe test. It's not a great result but it is exactly what you asked for. It's no worse than Seedream's result imo.
I agree that Seedream could definitely be called out as a fail since it might just be a trick of perspective.
Perhaps it would be an easy cop out of making a decision if you had to choose something outside of pass/fail.
Fail = 0 points
Partial = 0.5 points
Success = 1 point
I think the paws one is a good example where I think the new model got 100% while the other was more like 75%
- The giraffe's neck should be noticeably shorter than in the original image, while still maintaining a natural appearance.
- The final image cannot be accomplished by simply cropping out the neck or using perspective changes.