Art ID Glass on Copper Picture, who is the artist?

I have a small piece of art, approximately 3x4 inches. I believe it was made with powdered glass fired on copper. It is of green, yellow, blue, black and white. The picture is a girl with umbrella in the woods with two white swans. The artist explained that it was only fired once to creat the picture. It was purchased by my parents as a gift some fifty years ago in Tarrytown NY at a gallery very near the Tappan Zee Bridge. I think the artist was Greek and a older gentleman at the time. There were much larger pieces that I remember to be very expensive. It was explained that he was one of he few artist who had mastered this art form. Please help, I would love to locate more of his art!