Thanks for your great work, I've missed epub editions with the original illustrations – the novels just aren't the same without them.
I checked the book in Adobe DE and calibre reader; there's a minor snafu in the image stylesheet settings: When relative width is specified in the css, and absolute height and width are specified in the html, the width is set according to the css, and height according to the html, leading to a distorted aspect ratio.
The simplest remedy is to remove the height attribute from the <img> tags in the html, then height is set automatically according to the image aspect.
Hopefully this also works under iBooks...