the change above should show the billing info.
for the size and image, yoou can concatinate that to the product name.
find:
$MailBody = $MailBody . $fangearlive->DisplayInfo("Name");
and change it to:
$MailBody = $MailBody . "<img src=\"http://yourdomain.com/imagespath/".$fangearlive->DisplayInfo("Thumbnail")."\"><br />".$fangearlive->DisplayInfo("Name")."<br /> Size: ".$fangearlive->DisplayInfo("Size")."";
make sure to change:
http://yourdomain.com/imagespath
to your domain and the correct path to the thumbnails
the above code assumes that the column names for image and size are Thumbnail and Size, you will need to adjust accordingly.