Pixiv links seem to be broken
I can't test this empirically, but none of the Pixiv pages you link to exist. Every time I follow a Pixiv link, it tells me "work has been deleted or the ID does not exist".
I've found out why. The &s in the URLs are escaped, so "member_illust.php?mode=medium&id=123456" gets turned into "member_illust.php?mode=medium&id=123456", which of course makes Pixiv unable to find the image you linked.