This is one of my ancestors.
I'm just trying to identify the uniform and see if anyone can provide any other information about the photo.
I love the great work you guys do on this subreddit! Thank you!
I'm not sure about the uniform, but that star is almost certainly a plaque for a Chivalric Order, I think the Order of the Golden Lion of the House of Nassau, but it's hard to tell for sure. If it is, your ancestor was decidedly big in Dutch circles.