My second time trying to make this kind of LoRA, it's just a try, didn't use too many pictures when training. It mainly affects erect penis(not work very well with flaccid penis with foreskin). I recommand to use with erection up or you may get two penis in very rare cases. High-weight LoRA still has some impact, but won't be a disaster.

I found v2 is still not so good as v1 in the shape part, and also high-weight LoRA still destroys other style LoRAs. I trained over 100 epochs recently and not sure if there is a solution to get a perfect one. Actually the only thing we need is a penis length slider but not change thickness.

(i find something still testing)

So, there are my suggestions to use this lora.

If you think v2 is enough when in a low weight, you can directly use it.

If you think v1 with oil painting style is good, you can also directly use it.

If only high weight lora can get the shape you want i recommand

1. use img2img to redraw the painting. (the outcome may not be stable so I prefer the next one but it takes a little bit longer time)

2. use depth controlnet https://civarchive.com/models/1023507/illustrious-xl-depth-midas?modelVersionId=1480637 weight 0.7-1, start from 0% and end during (60-80)