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The main issue with the image is that it was sharpened a bit too much, getting rid of that kind of steamy blur which makes the floating leaves the artist did quite obvious, but other than that it looks fantastic! I also presume the plugin you're talking about is Acly/krita-ai-diffusion on github? I think there's a massive use case for AI when it comes to upscaling. Just need a good GPU for this kind of stuff which is going to become more of a problem.