She’s starting to get ideas…You’re really good with your hands!!
Also @friggmen, pages 11 and 15 aren’t the same size as the others.
But as others have pointed out, you really don’t need to upscale: I have to put my screen in 30% zoom in order for the page to be readable; otherwise, a single panel doesn’t even fit in the screen.
This is how it looks like if I keep my screen in full size: I can’t see the drawing and the bubbles at the same time. Unreadable.
As to how not to have the images pixelate after you worked on it… maybe don’t use crappy compression parameters when exporting? What software are you even using?