Key Takeaways
- Towel wrap (bath towel wrapped around body) is the most reliable coverage method. In 3/3 images, the towel securely covers from chest downward, maintaining a natural onsen atmosphere.
- Submerged up to shoulders provides effective water surface occlusion. However, the model tends to automatically add a tube-top-like garment, reducing the “bathing nude” impression.
- Bubble bath (bubble bath, foam covering body) has inconsistent coverage. Foam placement is irregular, and the chest may be visible through gaps in the bubbles.
- Steam (thick steam) is effective for atmosphere but weak for occlusion. It blurs body contours to some degree but doesn’t reliably cover anything.
- Hand covering (covering chest with hands) results in the highest exposure. Hands are placed on the chest but can’t fully cover it, with overflow being common.
Experiment Design
| Parameter | Value |
|---|
| Model | z-image-turbo (6B, photorealistic distilled) |
| Steps | 8 |
| CFG | 1.0 |
| Size | 1024x1024 |
| Seeds | 3 fixed (shared across all conditions) |
| Framing | upper body |
| Per condition | 3 images (3 seeds) |
| Total | 5 conditions x 3 = 15 images |
Condition Design
| Condition | Coverage method | Background |
|---|
| A00: Towel wrap | bath towel wrapped around body | onsen, steam |
| A01: Submerged to shoulders | submerged in bathtub up to shoulders | onsen, steam |
| A02: Bubble bath | in bubble bath, foam covering body | bathroom |
| A03: Steam | thick steam obscuring body, heavy fog | onsen |
| A04: Hand covering | covering chest with hands | onsen, steam |
Results by Condition
A00: Towel Wrap
1girl, 32yo japanese actress, in bathtub, bath towel wrapped around body, upper body, onsen, steam, warm lighting
Observations: In 3/3, a white bath towel securely covers from chest downward. The specified onsen background (wooden interior, steam, lantern lighting) renders naturally. The towel wrapping is consistent – shoulders and collarbones are exposed, but everything below is covered by the towel. The safest option for bath scenes.
A01: Submerged to Shoulders
1girl, 32yo japanese actress, submerged in bathtub up to shoulders, only head and shoulders above water, onsen, steam, warm lighting
Observations: In 3/3, the specified submerged-to-shoulders state was achieved, but tube-top or bandeau-like garments are visible underwater. The model tends to add clothing even in bath scenes. The water surface occlusion effect works, but the result doesn’t convey “bathing nude in an onsen.” The water surface reflections and transparency are beautiful.
A02: Bubble Bath
1girl, 32yo japanese actress, in bubble bath, foam covering body, upper body, bathroom, warm lighting
Observations: The specified bubble bath rendered in 3/3. The bathroom background includes candles, creating a nice atmosphere. However, foam coverage is incomplete – foam placement is irregular, and the chest may be visible through gaps. Even with foam covering body specified, foam density and placement are random. Bubble baths are great for atmosphere but unreliable for exposure control.
A03: Steam
1girl, 32yo japanese actress, in bathtub, thick steam obscuring body, heavy fog, onsen, upper body, warm lighting
Observations: The specified steam and fog effects rendered in 3/3, delivering the best onsen atmosphere of all 5 conditions. However, the occlusion effect of steam is limited – body contours remain faintly visible. Similar to submerged, tube-top-like garments tend to be added. Even with thick steam obscuring body, the steam doesn’t get dense enough to fully hide the body.
A04: Hand Covering
1girl, 32yo japanese actress, in bathtub, covering chest with hands, upper body, onsen, steam, warm lighting
Observations: In 3/3, hands are placed at chest level, but coverage is incomplete with significant chest exposure. Hands are too small relative to the chest, making full coverage impossible. This condition has the highest exposure of all 5. The specified onsen background and warm-toned lantern lighting work well together.
Comparison Summary
| Coverage method | Coverage stability | Exposure level | Atmosphere | Recommended use |
|---|
| Towel wrap | High (3/3) | Low | Onsen inn | Safe bath scenes |
| Submerged to shoulders | High (3/3) | Low-Medium | Onsen | Water surface effect + occlusion |
| Bubble bath | Medium (2/3) | Medium | Modern bathroom | Atmosphere-focused |
| Steam | Medium (2/3) | Medium | Open-air bath | Onsen atmosphere priority |
| Hand covering | Low (1/3) | High | Onsen | Intentional allure |
Practical Tips
Exposure Control Levels
- Minimum exposure (safe) ->
bath towel wrapped around body - Low-Medium exposure ->
submerged in bathtub up to shoulders (may auto-add clothing) - Medium exposure ->
in bubble bath, foam covering body or thick steam - High exposure ->
covering chest with hands (use with the understanding that coverage will be incomplete)
Onsen vs Bathroom
- onsen -> Wooden Japanese hot spring. Lanterns, bamboo fences, rocks. Pairs well with steam.
- bathroom -> Modern tiled bathroom. Candles, bathtub. Pairs well with bubble bath.
Note: Automatic Clothing Addition
Even when using submerged or steam, the model tends to automatically add tube tops or bandeaus. Full nudity is difficult even in bath scenes, with some clothing likely to appear. This can be viewed positively as a “fail-safe” characteristic.
Note: Towel wrap has high stability and is arguably the safest choice for exposure control. Bubble bath looks appealing but exposure control is unpredictable.
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