Thanks for the chapter.
I see that magazine pages (or frames) are always quite blurry (and when in colour, full of JPEG defects). I would suggest trying some AI upscaling service (there are some online that offer free upscales per day) to see if you could get better results (check an array of them and pick the best one).
In fact, if I'm not wrong, Stable Diffusion has an upscale mode that allows you to feed it an image to resize (check AUTOMATIC1111's GitHub for the installer and SD's site for the usage).