You are looking at a lot of used Star Trek Artwork. These are matted colorful Movie Era Prints of the Original Cast. Each Print is about 5 inches by 7 Inches matted.
There seems to be a residue on some of the items, I believe a type of cleaner that the light picks up at certain angles. The artist appears to be Cheryl S.
Mandus and the back of each print appears to be signed by the artist.
