Not bad for your first try! Those blacks are nice and dark! What method did you use to clean the pages? Some of them look good but others have significant artifacts, D.Gray-man especially. Others have been over-burned. You don't want to lose any of the image details by making the grays too dark. If you haven't tried this already, I recommend using a de-noising program to clean the high-res images such as NeatImage or Topaz Denoise (or both). They both have free versions you can use.

Beezlebub - There's some noise around the title and artifacts in the sky that should be cleaned, but otherwise this is fine.
Blazer Drive - The lower right panel has some dirty gray. It needs to be smoothed out. I recommend trying a surface blur in photoshop. The lines are also a bit blurry and could use some slight sharpening.
Demon Defense - too dark, over denoised (very blurry). Use a lighter touch when denoising and try to smooth the grays.
D.Gray-man - Wow what are all those artifacts? This one looks crazy! It's also been way over-leveled, making the contrast too high. You don't have hardly any grays, and what you do have has big artifacts in it.
FairyTail - Waaay too blurry. Don't try to sharpen it; it will have to be redone.
Naruto - Extremely blurry. (Same as above) Grays are excellent.
Reborn - Also too blurry and should be redone. Edit all the text out (except the bit at the very bottom).

Looking forward to version 2!