Acrylic, Stained glass paint, silicone sealer on canvas.
Done with the idea of simulating stained glass to some extent. It took a very long time to make the face smooth and get the graduated skin tones right.
I looked at several images in a book of renaissance paintings for inspiration.
Is it Mary? No, I don't think so. The lips have a hint of lipstick and the hair and skin colour don't seem to be right for Mary.