In response to a question from our friend "Motorway" from the "Anno Domini 1672" blog, I felt his question deserved more than just a simple answer, and that others may have some interest as well.
Unfortunately, the Dutch Army of William of Orange's period, specifically during the Franco-Dutch War of 1672, is not very well documented, either in print or online. The French are much better documented, both in artwork and in print, and the British in print, with some online sources as already published here. I can find very little about the warlike Bishop of Münster, except for historical abstracts about his campaign and alliances. Material that you've probably already found.
The plate above is taken from the VAE VICTUS web site's page on the Dutch Wars, a Google translation of which appears here, and does give several flags and uniform details, but many of them are from the later period. Whether they are accurate or not for the 1672 period I cannot say, but they might be a good starting point.
I did find the following two commercial source items on the On Military Matters web site; one in print from Sapherson, the other a CD by Robert Hall and distributed by Dan Schorr:
1-19660 Sapherson, C.A. DUTCH ARMY OF WILLIAM III, THE Covers the Army of the Netherland and subsidiarytroops, b/w illust of flags & standards, biblio.1 vol, 80 pgs 2003 HOPEWELL, OMM PUBLISHING
1-74840 Belaube, Jean & Claus-Peter Goldberg, DUTCH ARMY 1701-1714 CD contains text along with b/w & color images.1 vol, 1 pgs 2001 US, DAN SCHORR
Again, both of these are for a later period but may give good starting points. You might also try the KMLA web site on Dutch History for their page on the Franco-Dutch Wars, which does include some external links, here.
Also, while they deal more with the League of Augsburg, its worth checking out the painted figure galleries on Angus Konstam's Edinburgh Wargamer's site of his LoA Dutch Army, here, Or on Barry Hilton's League of Augsburg site for his painted Dutch, here. They don't share their sources, but I would suspect that Sapherson and Hall were included. Very nice painted troops and a lot of fun viewing them though. Sorry I can't offer more help at this time. Have you contacted the Dutch Royal Army Museum to see if they offer any printed resources?