Jan van Eyck - The Ghent Altarpiece - God Almighty (detail). Here we see the minutely observed detail which oil paint could achieve. It is generally agreed that it was van Eyck who first used oil paint on easel paintings.
The Virgin Mary ~ one of 24 compartmental scenes on The Ghent Altarpiece, Saint Bavo Cathedral, Ghent, Belgium. The work was begun by Hubert van Eyck and upon his death in 1426 it was completed by his brother Jan van Ecyk - completed in 1432