SD-Turbo results look good, but have color banding/look like painting

[AIisCool]

Very good results, but I am noticing color banding not present on the input images. Added "color banding" and "oil painting" to negative prompts, but it still appears. Happens even at 12 steps. Doesn't matter if I use "wavelet" "adain" or "nofix". Anything that can be done? Thank you.

Even on a color that is the same but different shades:

Also, so I don't open another issue, was wondering if there are any ways to get the output to look closer to the input. The upscale looks 95% close, and much cleaner, but still some slight differences happen. Basically I am wondering if it is possible to get 99% close to a 1:1 super resolution of the input image but with the enhanced clarity and details.

Sometimes areas of the input that are out of focus on purpose, get forced into focus, any way to prevent that?

[cswry]

Hello, SD-Turbo model does not recommend using CFG, so please do not add negative prompts.

[AIisCool]

Hello, SD-Turbo model does not recommend using CFG, so please do not add negative prompts.

@cswry I have the issue without any negative prompts though.

[cswry]

Hello, can you provide the input image?