Odd painting out

[operabuff]

Which painting is the odd one out? a) Raphael: 'The School of Athens'; b) JMW Turner: 'The Fighting Temeraire Tugged To Her last Berth To be Broken Up'; c) Seurat: 'Bathers At Asnieres'; d) Picasso: 'Portrait of Gertrude Stein'

Thanks in advance

[jno]

ummmm... the Raphael is a fresco and the rest are on canvas? I don't know, this is one of those things that could probably be answered a million ways.

[The Builder]

Seurat's would have been painted with a kind of stencil brush - the others with regular brushes...................?...........................who knows?