Recommended settings:

1. Sampler: Euler A

2. Scheduler: AYS/SGM Uniform

3. CFG: 6

4. Steps: 20-30 (You can go as low as 15)

5. Positive prompt: masterpiece, best quality
   

Recommended negative prompt: lowres, bad quality, worst quality, bad anatomy, jpeg artifacts, signature, watermark, sketch

I also recommend using this upscaler: https://openmodeldb.info/models/2x-AnimeSharpV4