I do not know anything about these paintings..

similar... http://www.liveauctioneers.com/item/1825613 http://www.liveauctioneers.com/item/4773933
http://www.goantiques.com/detail,reverse-glass-oil,992219.html
Search closed ebay auctions. Good luck.

I also have the picture "scene in venice" which is a reverse painting on glass.  It is about 12 1/2" wide by 18" tall.  Mine also came from an attic.  I found it in my moms...not the best place to store due to extreme heat and cold but non the less it is in great shape.  I do not know anything about it either.  If anyone has info on the specific pic, age, artist, value, etc.... I'd appreciate the info.  Thanks

This art form has been around for many years. It was widely used for sacral paintings since Middle Ages. The most famous was the art of icons in the Byzantine Empire. Later the painting on glass spread to Italy where in Venice it influenced its Renaissance art. Since the middle of the 18th century, painting on glass became favored by the Church and the nobility throughout Central Europe. A number of clock faces were created using this technique in the early-to-mid-19th century. Throughout the 19th century painting on glass was widely popular as folk art in Austria, Bavaria, Moravia, Bohemia and Slovakia. Unfortunately, during the inter-war period (1914–1945) this traditional "naive" technique fell nearly to a complete oblivion and its methods of paint composition and structural layout had to be re-invented by combining acrylic and oil paints. Also the style of painting and especially the themes had to be varied and adjusted to new perceptions of the world in modern times. Thus painting on glass started to become popular again since the 1990s. However, many painters of this genre affirm that abandoning that unique tradition of naivist approach to painting on glass is rather difficult. Therefore the painting on glass becomes a natural selection for refurbishing a new house built in a traditional rustic style. For example, the recently erected Catholic church at Radôstka in Northern Slovakia opted for having its Stations of the Cross on 14 large pictures – all painted on glass painted faux tiger maple was popular around/1829-1835. Frame Convex Curved Domed Bubble GLASS Reverse Painting.  Worth around $50.00 to $150.00 each depends on condition..would have loved to see the back of the paintings. Note: Im not an expert on this.. good luck