Recommended (tested) Settings:
Euler A(ncestral) Sampler, 20-30 steps. 7-9 CFG. For a painterly approach I haven't seen much of a benefit above 20 steps, but for detailed lineart you may need a little bit more.
Standard SDXL VAE
It seems to work well with most settings I have tried, so go hog wild. I've generally found it requires fewer steps than base SDXL to get great results.
