I'm currently in the process of editing all my current comic pages and noticed that all my pages sort of lean to the right side.
Example. http://www.drunkduck.com/Gesen/index.php?p=748635
I don't think it looks good at all and need to know if there's some sort of "best" or recommended page size. I draw all my pages at A5 size, and scan (edit the text and auto fix only) then upload them. Typical page sized is 1150x1624 pixels.

Suggestions?

Well, the pages are pretty wide (600 pixels wide is usually sufficient for a portrait-oriented comic).... but the "right-leaning" has more to do with the default comic page template than the width of your page, really. It's trying to centre the image within the middle area of the page and not the middle of the page as a whole.

I'd recommend making your pages smaller anyway, but the page centering works differently on some of the other templates you can choose from, so you might want to look at those too.

I see. Thank you. Very fast reply speed, btw, thanks.

8D Now I can continue my editing!!