Key Takeaways
- sweaty, perspiration on skin, and post-workout sweat are visually nearly identical. All three add a light sheen and moisture to the skin. The difference from control is visible, but differences among these three keywords are very small.
- dripping sweat produces the most visible moisture. Droplet-like expressions were observed on the face and decolletage, with a clearly stronger “sweating” impression than the other three keywords.
- Gym background pairing is effective. A gym background provides more natural context for sweat expressions than a white background, and single-person compositions were more stable.
- For token efficiency,
sweaty(1 token) is optimal. Usedripping sweat(2 tokens) only when you want to emphasize heavy sweating.
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 |
Base Prompt
The {SWEAT_TYPE} portion is replaced with the following patterns:
| Condition | SWEAT_TYPE |
|---|---|
| A00: Control | (none) |
| A01: sweaty | sweaty |
| A02: perspiration | perspiration on skin |
| A03: post-workout | post-workout sweat |
| A04: dripping | dripping sweat |
Evaluation Criteria
- Sweat visibility: Whether sweat/moisture is visible on the skin surface
- Sweat volume: Light sheen level vs. visible droplet level
- Sweat distribution: Where sweat appears — face, chest, arms, abdomen
- Clothing impact: Whether sweat stains appear on the sports bra or shorts
Testing Each Condition
A00: Control (No Sweat Modifier)
| seed 1 | seed 2 | seed 3 |
|---|---|---|
![]() | ![]() | ![]() |
Observations: 3/3 produced stable compositions with sports bra and shorts against a gym background. Skin is matte and dry with no sweat or sheen. Gym background reproduction is high quality, with training machines and floor mats naturally rendered.
A01: sweaty
| seed 1 | seed 2 | seed 3 |
|---|---|---|
![]() | ![]() | ![]() |
Observations: 3/3 showed a light sheen on the skin, particularly around the collarbone, upper chest, and shoulders. When compared side-by-side with the control, the difference is noticeable, but viewed alone it appears as “slightly shiny skin.” No clear sweat droplets were observed.
A02: perspiration on skin
| seed 1 | seed 2 | seed 3 |
|---|---|---|
![]() | ![]() | ![]() |
Observations: 3/3 showed skin sheen. The difference from sweaty is minimal — even comparing the same seeds side by side, it’s hard to point out clear distinctions. Perspiration uses 3 tokens but produces results indistinguishable from the 1-token sweaty, making it less token-efficient.
A03: post-workout sweat
| seed 1 | seed 2 | seed 3 |
|---|---|---|
![]() | ![]() | ![]() |
Observations: 3/3 showed skin sheen. Results are nearly identical to sweaty and perspiration. Although “post-workout” adds contextual information, there was no notable difference in visual sweat expression. No “post-workout” specific changes in composition or pose (like fatigued postures) were observed either.
A04: dripping sweat
| seed 1 | seed 2 | seed 3 |
|---|---|---|
![]() | ![]() | ![]() |
Observations: 3/3 showed skin sheen. Compared to the other three conditions, droplet-like expressions on the face and decolletage were the most prominent. In seed 2, what appears to be water droplets running down the cheeks and neck were observed. There’s also a subtle dampness to the sports bra fabric. The “dripping” meaning is reflected, making this the strongest sweat expression among all four conditions.
Comparison Summary
| Keyword | Sweat Reproduction | Sweat Intensity | Token Count | Characteristics |
|---|---|---|---|---|
| (none) | 0/3 | None | 0 | Matte, dry skin |
| sweaty | 3/3 | Weak-Medium | 1 | Light sheen, unclear droplets |
| perspiration on skin | 3/3 | Weak-Medium | 3 | Nearly identical to sweaty |
| post-workout sweat | 3/3 | Weak-Medium | 3 | Nearly identical to sweaty |
| dripping sweat | 3/3 | Medium-Strong | 2 | Most prominent droplet expression |
Practical Tips
Usage Guide
- Want a subtle sweat atmosphere →
sweaty(1 token). Best cost-performance. - Want to emphasize heavy sweating →
dripping sweat(2 tokens). Clear droplet expression. - perspiration and post-workout sweat are not recommended → Same results as sweaty but costs extra tokens.
Difference from oiled body
In the previous oil expression test, we confirmed that oiled body also adds skin sheen. The differences from sweaty are:
- sweaty carries nuances of sweat droplets and dampness, fitting naturally into gym and exercise scene contexts
- oiled body produces a uniform glossy sheen, suited for gravure shoots and beach scenes
- The visual difference is small, but choosing based on situational context is the sensible approach
Note: “Sweat” and “oil” can be hard to tell apart visually in photos. Choosing the prompt based on situational context is the sensible approach.















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