hiya. i hope you don't mind a suggestion. you are using comicpress which is equipped so your graphic can be 760 pixels in width and whatever height you want. why are you shrinking down the image so small and making it float in the white space? it makes it too difficult to read. the art looked good, but i couldn't be bothered to make out the text.
if you decide to resize them, it's simple. just name the file the exact same name and re-upload it, allowing the new one to override the old. i've had to do it when i made a stupid typo once and it worked like a charm.
anyway, other than being unnecessarily small, it looks good.
i wish you the best.