Key Takeaways
crop top and low-rise jeans alone is enough for stable navel exposure. The additional effect of navel visible is limited — outfit specification alone is sufficient.toned stomach, visible abs is effective for ab definition. Combined with a gym background and sports bra, clear muscle shadow detail on the abdomen was achieved.soft belly has unclear effects. Even with a bikini, the “soft belly” texture difference is hard to distinguish from the control.- Navel exposure is determined by the outfit’s cut line (crop top length). Outfit design matters more than keywords.
Experiment Design
| Parameter | Value |
|---|
| Model | z-image-turbo |
| Seeds | 3 fixed |
| Total | 4 conditions × 3 = 12 images |
Conditions
| Condition | Outfit | Belly Modifier | Background |
|---|
| A00 | crop top + low-rise jeans | none | white background |
| A01 | crop top + low-rise jeans | navel visible | white background |
| A02 | sports bra + shorts | toned stomach, visible abs | gym |
| A03 | bikini top | soft belly | beach |
Results by Condition
A00: Control (crop top)
1girl, 32yo japanese actress, wearing crop top and low-rise jeans, standing, facing camera, upper body, simple white background, soft studio lighting
Observations: In 3/3 images, the crop top and low-rise jeans combination exposed the navel area. The navel was visible in 2/3. Outfit specification alone provides sufficient navel exposure.
A01: navel visible
1girl, 32yo japanese actress, wearing crop top and low-rise jeans, navel visible, standing, facing camera, upper body, simple white background, soft studio lighting
Observations: The difference from A00 is minimal. Adding navel visible may make the navel slightly more defined, but it falls within seed-to-seed variation. The crop top length is the primary factor for navel exposure.
A02: toned stomach (abs)
1girl, 32yo japanese actress, wearing sports bra and shorts, toned stomach, visible abs, standing, facing camera, upper body, gym background, bright lighting
Observations: Clear ab muscle shadows confirmed in 3/3. With toned stomach, visible abs plus a gym background, vertical muscle lines appeared on the abdomen, reproducing a toned belly. Seed 2 shows particularly beautiful abs, with subtle oblique definition visible between the sports bra. This is the most “fitness gravure” style belly expression.
🗨️ Lab Director: These abs are insane. Just switching to a gym background instantly gives that fitness model vibe.
A03: soft belly
1girl, 32yo japanese actress, wearing bikini top, soft belly, standing, facing camera, upper body, beach background, bright sunlight
Observations: Beach background with bikini. The effect of soft belly is unclear — the belly texture is hard to distinguish from A00. The quality as a beach photo is high.
Practical Tips
- Navel exposure:
crop top + low-rise outfit specification is the baseline. No additional keywords needed - Ab definition:
toned stomach, visible abs + gym background + sports bra. Background and outfit context reinforce the effect - Soft belly: Difficult to control reliably. Depends on the subject’s default body type
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