The right lens shows Antwerp Central Station, which is one of the most stunning train stations I've visited. It was finished in 1905 and the architecture features a dome on top. A clock framed by beautiful arched windows (which you can see in this photo from my Etsy shop) dominates the interior.
In the left lens is Hungarian operetta singer Sari Petrass as she would have looked if she had been on her way to an evening performance in the city before WWI. In reality, she didn't arrive in Antwerp until 1930, when the car she was riding in attempted to board a ferry and instead crashed into the river, where she drowned.
The painting is made with egg tempera, and each lens measures only 4.5cm (1.75") across.