Use anywhere from weight 0.3 to 0.9.
Training images are based on the anime, which is pretty flat and undetailed. Somewhere around 0.5 weight for most models works well. Anything higher and the images become a bit too "simple". For something like Meina Unreal, you can get away with higher weights.
Pic 1: YesMix
Pics 2&3: Meina Unreal
Pic 4: AnyLoRA