I wish I could help you directly with your search, but I do not have any photos in my personal collection from "The House Without a Key." However, you may try contacting the USC Film Library as I know that they have stills from films available for use and they will produce high quality copies on request for a fee. You may also try the UCLA Film Library, although I am not familiar with their practices with regard to film images.
I hope that this may be of some help to you, and the best of luck as you work on your project. Please keep us informed as to a release date.
