I agree with most of what
me3 said and he's on point about the prompt. However I have to strongly disagree that hiresfix is only increasing the canvas size.
This is simply not true. The point of hiresfix and what makes it superior to normal upscaling with extra tab or img2img is that it is part of the generative process and adds new pixels to the image while normal upscaling can't invent pixels that are not already there, so normal upscaling only increase the canvas size but hiresfix actually increase the image quality.
There's an add-on that's on my to do list to try out that is called
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that is supposedly increasing the actual image quality just like hiresfix does and it has sliders and settings for color and maybe light etc. I have not tried it yet so I can't comment how it stacks up against hiresfix or if it could be a compliment. It is for img2img tab so you need to generate an image first so you might as well use hiresfix for this and then use Loopback Scaler to increase the visuals even further. I will have to test and see if it can be used successfully this way.