Conclusion
Maximum Size: super strong super huge gigantic breasts, massive tits, enormous boobs
Out of 30+ conditions tested, this is the description that produced the largest breasts (11 words).
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However, 11 words consume a large portion of your total token budget. That leaves less room for composition, lighting, clothing, and other details.
Token-Efficient Pick: oversized massive tits, enormous boobs
If token efficiency matters, this 5-word description comes close to the maximum.
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The size difference compared to the 11-word full stack is small, and you can spend the remaining tokens on other elements.
Recommendations by Use Case
| Goal | Description | Word count |
|---|---|---|
| Absolute maximum | super strong super huge gigantic breasts, massive tits, enormous boobs | 11 |
| Large + room for other details | oversized massive tits, enormous boobs | 5 |
| Quick and easy | massive tits | 2 |
| Hide nipples | Any of the above + change outfit to padded bikini top or tight crop top | — |
Just want the bottom line? See The Definitive Breast Size Prompt Guide.
When you want “bigger breasts” in AI image generation, which prompt description is the most effective? We compared 30+ conditions — size adjectives, slang, cup size notation, cm measurements, weight syntax, stacking, and more — in a controlled environment.
Experiment Conditions
| Item | Value |
|---|---|
| Model | z-image-turbo (6B, photorealism-focused distilled model) |
| Steps | 8 |
| Sampler | euler |
| Scheduler | ddim_uniform |
| CFG | 1.0 |
| Image size | 1024×1024 |
| Seed | 3 seeds used across all conditions |
Base Prompt
Only the {VARIABLE} part was swapped. A low-coverage string bikini top was used to make size differences easy to see.
Effective Descriptions — Details
Step-by-Step Size Adjective Comparison
Testing large → huge → gigantic progressively. Confirmed that at the single-word level, huge hits a ceiling.
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| Control | huge breasts | super strong...gigantic |
Stacking Effect and the Size Token Volume Hypothesis
Stacking size adjectives is additive. Even repeating huge ×5 works. Non-size adjectives have no effect.
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massive tits (2 words) | + enormous boobs (4 words) | 11-word full stack |
oversized Is the Strongest Single Adjective
oversized massive tits, enormous boobs (5 words) achieves near-maximum size. Best cost-efficiency.
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oversized breasts | + massive tits (3 words) | + enormous boobs (5 words) |
Hiding Nipples with Outfit Changes
padded bikini top and tight crop top can suppress exposure. Button shirts and knitwear tend to “lose” to the breasts.
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padded bikini top | tight crop top | tight dress |
Descriptions That Had No Effect
The following approaches had no effect on breast size. See the individual articles for details.
- Cup size notation (G-cup, K-cup, double D) doesn’t work
- cm measurements (120cm, 150cm) don’t work
- Weight syntax (
(huge breasts:1.6)etc.) doesn’t work - Metaphors are dangerous — bombs, watermelons, and cows appear
- Japanese romaji
oppaidoesn’t work super/strongprefixes alone don’t work- Replacing
tits/boobswithbreastsdoesn’t hide nipples (N=13, all exposed)
Key Findings
- At the single-word level,
hugeis the ceiling - Stacking multiple size-related adjectives increases breast size (stacking effect)
- Repeating the same word also produces a stacking effect
- Stacking adjectives unrelated to size has no effect
oversizedis the single most effective adjective- Cup size notation, cm measurements, and weight syntax have no effect
- Metaphors cause unintended objects to appear
- Breast size is maintained even when outfit is changed
- Hiding nipples requires an outfit change, but consistency is not guaranteed
![[Experiment] Prompts for "Long Breasts" | 31 Conditions, 186 Images](/tips/long-breast-descriptor-test/f03_huge_navel_front_s1_0_0000_2053695854357871006.webp)
![[Experiment] Prompts for Long Nipples | 75 Images of Thorough Testing](/tips/nipple-length-descriptor-test/cylinder_0_0_0000_1787699347943046438.webp)
![[Experiment] Flat Chest Prompts Fail Across All 35 Conditions | 192 Images](/tips/flat-chest-descriptor-test/a00_control_front_s1_0_0000_2053695854357871006.webp)
