...suitable to illustrate a poster for a concert entitled 'Visions of the Beyond'?
It's late 19th / early 20thC English stuff (Elgar, Vaughan Williams etc), more sacred than secular.
My first thought was Blake but his paintings are a bit, well scary, so perhaps a Pre-Raphaelite maiden peering into a mirror to see the future or similar?
I have exhausted the normal sources and am a bit stumped...