>>2817866blurriness is also a factor of the model and upscaler. This can usually be fixed with an additional img2img pass at low denoising.
Here I've downscaled
>>2817498 and re-upscaled it at 0.4 denoising. Notice the outer lines especially are more crisp and defined, and this is likely because I used based67 which is known for producing very clean lines.
Note that I'm not saying it's "wrong" to have softer lineart or a chromatic abberation effect from a model, it's just a different aesthetic and some people view this as being blurry.