Hello hello!
Real good job :D but a couple suggestions. A) resize please to 1200. Second of all here is a pic that i did, although i didn't use denoise which i normally do, so it would have looked better then, but i think you forgot to level it a little bit. So just level it a little. And finally borders. Please make sure all borders are 90 degrees, so basically you have to redo all of the borders. That's if you want to do high quality though ^^
those were for the last two
The last one you need to a) split the pages, b) crop the page, c) get read of the website url.
So yep those are my suggestions!

Gotta agree with Jaion, i like the whitish backgroud.

Topaz denoise and clean, and gaussian blurr.
But i haven't really played with it to see the best product yet. so that was just what manga's usually need. it turned out okay.
Anyways i did the following steps.
I guassian blurred it resized it to size 1200. Then topaz denoised it: denoise~ 1 Retaining detail ~ 0.45
Then i sharpened it.
Then used topaz clean.
But like i said i haven't really played with this one. i just did a quick run over it in five minutes.

Isn't that manga licensed, i remember someone telling me to read that once.....