Strength of the LoRA at your pleasure, suggested a strong one though 0.9-1.3
There is really only one trigger to use:
flat color
If you use character LoRAs combined with this one, you may need to lower that LoRA's strength a lot because it can work with character LoRAs. Adding the Negatives from the line below tends to make it work better.
If you are doing manga style images I found placing this in the Negative to give a good look: score_5, score_4, 3d, render, censored, source_cartoon, source_western
Important: remove "pony score" tags from your Positive for more accurate line art