Allegedly, his longtime assistant "Gwen" was given the rights. See the forum posting by his grandson Willy linked below.
You would have to have the permission of the artist or company that holds the copyright on the artwork.
I would assume Richard O'Brien still holds the copyright.
The source of the lyrics, the album sleeve notes, or the artist's website will indicate who holds the copyright. It will be listed close to the © symbol. It will usually be the artist's record company.
Unless other arrangements were made, the creator is the initial copyright holder.
Warner-Tamerlane.
Muppets, Inc.
Unless other arrangements were made, the creator is the initial copyright holder.
The Richmond Organization.
The Rank Organization.
Catchme.com is registered to Slingshot Labs.
Little, Brown.
Yes, altering an image does not automatically remove its copyright. The original creator still holds the copyright to the altered image.