As much your intentions are good, the cleaning suffers from a lack of gradient. I don't know if your monitor don't show this, but I clearly notice some GREY traces on a supposedly WHITE bubbles. Best recommendation I can give: copy the same color for the bubbles before cleaning.
Thanks, anyway.
EDIT: You used the downscaled files, instead of the original resolution.
WARNING If you care about the resolution of your RAWs and want to use the full size images, than this gallery is not for you. These images are only at e-hentai's standard 1280px horizontal res and not at full resolution.
Base +19, klermun +13, tobeunforgiven2 +24, Megaton +45