This model is very flexible for a lot of different cases. It is not the best at any one thing, but quite good in a lot of different scenarios! I personally use upscaling too but it is very good towards concepts and some weirder things.
Personally I use these generation settings:
Size - 768x768 is what I use, but it's super flexible here too!
Sampling method: DPM++ 2M / DPM++ 2M SDE
Schedule Type: Karras / Exponential
Sampling Steps: 20-40
CFG Scale: 4-6
Again, highly recommended to use ADetailer or upscaling as it can be a bit blurry due to the flexibility :)
Description
Place these tags at the start of the prompt:
score_9, score_8_up, score_7_up,Negatives:
score_5, score_4,watermark, low quality, worse quality, ugly face