I have always liked silhouette pictures. These were found at a local thrift store and I was thrilled to get them. They are reverse paintings on glass. I think these would be from the 1930’s or 40’s. The glass is slightly convex, adding some depth to the images.
Note: These have been SOLD
fabfindsblog 
they are fantastic, and i like them arranged the way you have them. terrific find!