Who knows if the guy even saw the movie? He might have been given some stills to work with and cranked out the poster.
As I've been pointing out, it would definitely seem to be the case that the poster was created from stills. I've already pointed out two instances where that is most certainly the case, and there's also evidence for a third still having been the inspiration for the hanging image inside the mouth of Angelique's decaying image. As such, I've often wondered if the depiction of Angelique's ghost in the artwork is also based on a still? If so, regrettably, I've never come across it. And I've also never come across a still of the pallbearers carrying the coffin up on their shoulders. Interestingly enough, they don't carry it that way in the film - but as we know when it comes to other stills, the stills don't always accurately reflect how a scene plays in the film. As for the decaying Angelique, I suspect that might have been pure imagination - but who knows?
And as for the one who created the poster having seen the film beforehand, I doubt that would have been possible because of how DC's final edit wasn't completed until a very short time before the film was going to be released.
And speaking of the person who created at the very least the A Poster's artwork, thanks to
a listing from 2019 of the sale of the NoDS 14X36 Insert Card on the Heritage Auctions Web site, his name is John Solie. Apparently he was quite renowned for his movie poster art, for which he was highly sought after, as well as other types of artwork. Considering his high profile in the movie business, I'm quite surprised that his name doesn't seem to have ever come up in articles written about NoDS, particularly when they've referenced the A Poster. If it wasn't for the fact that quite by accident last October I came across that listing, I still wouldn't know he did the artwork.
![NoDS Angelique [nods]](http://www.dsboards.com/SMF/Smileys/classic/index.jpg)