What is that technique?

No.4468629 ViewReplyOriginalReport
https://apolloniasaintclair.com/

This amazing artist has really stunning piecess of artwork, from the nature of their descriptions ("Ink is my blood") I suggest they are all made with Rotring. But, some lines are so clear that I wonder, maybe she used Illustrator and just made them look like that? Correct me if I'm wrong, but I haven't seen such masterpieces done with Ink.