Fixing hands... is such a pain T_T (part 1)

Yes, SDXL doesn't know how to draw hands. Yes, Flux is better (but really, i got messed up hands with Flux too).

Yes, most Pony models killed even more hands in the finetuning/merging process, creating the need for all of those "Hands" LoRA and Negative Embeddings. Oh and inpainting. But really, it's a pain in the *** to do and Adetailer is not as good with hands than it is with face.

Yes, Illustrious is better with hands... but as more merge and stuff happen, it get weirder too.

So, most of the time, when i do stuff on my models, at one point, hands die on me. And i need to fix them. I usually do it by merging back a very small amount of a model that is close in look to what i want to achieve but still give good hands. And throw a "Hands" LoRA in the mix, switching back and forth between the three i got in my pocket:

Here is an example of where I am standing with AlterBan V2 (not the worst case, but still not great):

Now, i could do what is usually do, but i wanted to try and make a "Hand Patcher" that could incorporate a bit of the different approach the previous LoRA did. So, let's try some small weights;

<lora:DetailedPerfect_hands_r1:0.1> <lora:hand 5.5:0.1> <lora:HandFineTuning_XL:0.2>

Oh oh! Not too much impact on the overall picture (the background change a lot, but clothes and character, not too much, it could be acceptable). And hands got a little better.

Let's try the merge (i am doing those on CPU, my GPU sometimes fails due to low VRAM):

And the result is... wrong. Hands aren't bad, just completely different.

It is probably because i was overly optimistic when making it a 32 dimensions LoRA:

Detailed/Perfect hands is a 32 dimensions LoRA, ok!
Hands Fine Tune is a 64 dimensions LoRA, hum.
Hands XL 5.5 is a 128 dimensions LoRA, oups... ^^;

So... let's be less of a cheapskate and go for a 64 dimensions:

And guess what? Still not good!

Downgrading Hands XL may not have been a good idea. So, let's upgrade the other LoRAs to 128 and then merge them together cleanly. To do so, the other two are "merged" alone with dimension remake at 128.