For best outputs:

Sampler: DPM++ 2M Karras.

Steps: 26, cfg 7.5, CLIP skip 2.

VAE: none.

Pos prompt: use quality keywords to enhance overall quality, for example, "(masterpiece, top quality, best quality, official art, beautiful and aesthetic:1.2)".

Neg prompt: "(worst quality:2), (low quality:2), (normal quality:2), (monochrome), normal quality, lowres, watermark, badhandv4", being the embedding "badhandv4" included in my example runs.

What changes from v3.0 to v4.2: input_image feature.

Checkpoint Merge.