Its stable at strength 05 - 1, but you can crank it up to 1.5 if you want it to look more like original. Recommended Adetailer for faces and Regional prompter if you want the characters to interract. Dont forget to set strength to half when using regional prompter.

Trained exclusively on the manga, so you may have to specify different colors as the model couldnt infer them from b&w images.