A full oil portrait will set you back something like 30,000, but you can get a charcoal sketch for just 2,500.

A charcoal sketch of the painting sold for $107,000 in 1999.

Almost timeless are the fine arts media of charcoal sketch, oil paint, watercolor, pen and ink drawing, sculpture, and etching.

The show moves from his shadowy monochromes, his charcoal sketches and lithographs, towards the pastels and oil paintings which glow with a vaporous brightness.

He produced only a handful of charcoal sketches from this period in his life.