For best outputs and usage:

Sampler: Restart, DPM++ 2M Karras, Euler a.

Steps: 40 ~ 60, cfg 6, CLIP skip 2.

VAE: none required.

Pos prompt: start it with "zPDXL2, score_9, score_8_up, score_7_up", being the embedding "zPDXL2" included in my example runs.

Neg prompt: "score_1, score_2, score_3, score_4, score_5, score_6, zPDXL2-neg, watermark, text, signature, logo, monochrome, censored, extra limbs, (bad hands, extra fingers), bad anatomy, muscular, censored, disfigured, ugly, amputee", being the embedding "zPDXL2-neg" included in my example runs.

Note about the samplers: the best outputs are managed with Restart and 50 ~ 60 steps, but this will also mean that a run will take average 2 ~ 3 minutes (for 3 outputs) generation time. It's long, but the visual quality will be the best. In case you don't want to wait this long, DPM++ 2M Karras and Euler a are way faster, with average 90s generation time.

Checkpoint Merge.