ANC - Flat Chest

This LoRA renders realistic very small breasts and works with different body types, different ages and for both nude and clothed characters.

This LoRA is part of the "Amateur Nudes Collection" aiming to enable all the excellent NSFW base models out there to render more realistic and more diverse body types.

FLUX LoRA now available!

A new version of this model, trained on a newly curated dataset is now available for FLUX.1 [dev]. Please see the notes below for usage tips.

Usage and Prompting

FLUX:
The FLUX LoRA works best with the FLUX.1 [dev] base checkpoint. If you are using the base checkpoint (all preview images have been generated with the base checkpoint), simply drop the LoRA in at a strength of 0.7 and prompt for a woman with a flat chest. If you want to use the LoRA on a finetuned checkpoint, you might have to crank the strength up to around 1.2, however, you may not receive very satisfying results (see the "limitations" section below for more information)

SDXL:
Drop the lora in and prompt for a "flat chest". Extra tip: use the LoRA with lower strength (0.1 - 0.5) as a slider to adjust the breast shape in conjunction with a different breast size prompt. Tested on STOIQOAfrodite and Juggernaut XL.

Negative Prompts

FLUX:
Flux does not require/support any negative prompts, so don't bother.

SDXL:
The actual breast size rendered using this LoRA seems very much to depend on the general bias of the base model towards breast size - in order to increase the effect, put "large breasts" into the negative prompt.

When generating clothed pictures, be sure to add "nude" to the negative prompt so as to reduce the likelihood of still receiving a bare breast. If this does not help, try to describe the clothes in more detail, that should sort out the issues in most cases.

Limitations

FLUX:
This LoRA does not work very well with finetuned checkpoints (I tested with STOIQO Afrodite and getphat) - while it would greatly reduce the size of the generated breasts those models, they are far from a "flat chest". Increasing the LoRA strength to about 1.2 (expect artifacts beyond that) helped somewhat, but still didn't yield satisfactory results. If you want to generate nudes, I recommend you generate them on the F.1d base checkpoint and then use a model that can generate decent nipples for inpainting (which I did for the first sample image). Alternatively, you may try to add in a specialized nipple lora such as Nipples FLUX at a low weight (around 0.5).

SDXL:
The quality of generated nipples in side view (prompt "from side") might be lacking at times. However, in this perspective, ADetailer may fail to recognize the breast as such. In this case, I recommend to run HiRes Fix with an upscale factor of 1 to add another rendering pass.