Nice! GJ! And grats on being touched by the elevens.
If I could have a suggestion, when saving B&W as png use grayscale mode instead of RGB, and, in case of line-art type images (ie. with little to no gradients) you can go one step further and use indexed color mode.
This is a nice comic and all, but it seriously doesn't have to be 2MB, saved in 8 colors indexed mode it amounts to just under 300kb, with no quality loss.
It's at the Jun Board, the easiest way of finding the Yukkuri Threads is by visiting [url=http://yukkuri-futaba.sakura.ne.jp/]The Yukkuri Futaba Tracker[/url].