This is being covered on BBC News this morning.
Link 1: BBC - Your Paintings
Link 2: BBC - Your Paintings Blog: Your Paintings: an art resource for all teachers
If you’re a teacher, you can now draw on paintings by nearly 20,000 artists, in a wide range of styles, painted over the last 800 years. Most of the great masters are well represented, with some of their best known works - but also examples of their lesser known paintings.