This is a pastel by M. Pirner of Hecate from 1901.
I could've rambled about my own art here, but a lot of my training is actually in art history, so I couldn't just go with one... or with any old piece. :0)
Patricia Ariel's Hecate
Alphons Marie Mucha's poster for his Slav Epic. The figure in the background is a Slavic Goddess.