The images are fine but in higher rest screens it does look very noisy, you should try using remacri as an upscaler and use jpg images while having a 2k or even 4k resolution on them. If you're generating locally you may try to use things like CFG Rescale, Adetailer with a face model, and hi-res fix post generation on a 1.25 or even 1.5 if you have enough VRAM while using remacri