If i must choose one of the best illustrators working from the Netherlands in the last century it would be Kurt Löb.
Born in Germany he fled to the Netherlands and build a career in illustrating books, magazine and at the same time produced many great paintings and drawings. The style “fin du siecle” with loose abstract elements. He must have been influenced by Austrian Art from the 1900’s , but in his career he definitely created a style of his own. These drawings belong to the very best dutch/ german illustrators.
http://www.ftn-books.com has a nice signed copy of the Löb / Bild + Buch publication available.