All images out of the box, upscaled during creation, no postprocessing.
Recommendations (default use):
Optimum CFG-Scale: 7,5
Best Upscaler: SwinIR (Denoising 0,1-0,3)
Sampler Best Results:
DPM++ 2S a Karras
DPM++ 3M SDE
DPM2 a Karras
To improve Quality positive prompts like "8k, epic realistic, ultra detail" and negative prompts like "bad hands" improve the result slightly. "Deformed" is sometimes useful but can prevent creative output.
I hope you enjoy and share your images.