My first kilnformed glass experiment -- complete! I have hope. These test pieces turned out much better than I had expected.
My thought is to place these transparent cloud pieces over some of the cloud portions of the image, as in the first photo, so the image is somewhat mysteriously showing through. The white/clear edges of the piece on the right in the lower photo are a great effect -- in this piece, they are way too thin and would break readily, but I can work with this in subsequent tests.