I don't have access to digital pics of these photos, nor do I have a scanner. But you can find many 1991 promotional photos (I'd assume all available photos) in the following two books:
"Dark Shadows Resurrected" by Jim Pierson, and
"Dark Shadows in the 90s - The Dark Shadows Concordance 1991" by Kathleen Resch and others
Both books are filled with wonderful publicity photos from the 91 series. But, the Pierson book contains more full color photos. Many of them are just beautiful.
Hope this helps.