Dark Star, I think these images need to be touched up (levelling the whites and grays and removing bleed-through) before uploading. I'm willing to do this for you (as well as subsequent translating if I have time).

Side-note: Putting a dark piece of paper behind the page that is being scanned can help reduce bleed-through. Generally we want to avoid editing the image as much as possible.

Another issue is that the screentones in the first panel has been messed up due to resizing. 'though that could be the artist's fault instead of the scanning.