Here's the checkpoint I use to make the cover samples

It's a merge of some popular checkpoint

• Use hires fix

• Use DPM ++ SDE Karras

• Use ERSGAN 4X+Anime 6B

• Use 6 CFG

• Use Use 0.5 denoise

• Use 12 hires steps

You can experiment it all you want, the guide above is basically my template to use the checkpoint