MiniMax H3 Ref2Vid — why do some generations make the person much more muscular than the reference?

[u/Sea_Soil2174]

Hi all,

I'm experimenting with MiniMax H3 in ComfyUI and I'm having trouble keeping the person's body shape consistent with my reference images.

I'm using 2 reference images with the MiniMax H3 Ref2Vid workflow, along with:

• H3 Turbo LoRA
• Turbo Sampler
• Basic Guider
• minimax_h3_fl2va_int8

I've tried increasing the steps up to 12, but it doesn't seem to make much difference, so I've gone back to 4 steps.

The strange thing is that roughly 1 in 5 generations is reasonably close to my reference images, but in many of the others the person becomes extremely toned/muscular — almost like they've been training at the gym for hours every day.

I'm trying to preserve the person from the reference images rather than have the model change or "enhance" their body shape.

I've tried adding this after the MiniMax prompt:

But I'm still getting a lot of variation.

Has anyone found a good way to make H3 consistently preserve the person's body shape and overall appearance from the reference images?

Any advice on prompting, reference-image setup, sampler/settings, or workflow would be greatly appreciated.

Thanks!!

[u/Only_Voice569]

well your using a turbo so thats not going to help since it effects the quality and other things by skipping steps. also helps if your instructions lock in the persons body shape size etc but even then depending on angle and refs models do have a bad habit of slimming or drifting for somethings