Been... To see Holbein's Ambassadors, one of the most enigmatic paintings of Jean de Dinteville, French ambassador to the court of Henry VIII. An enduringly curious aspect of the painting is the distorted image of a skull which can only be seen from a certain angle.
To Feb 1, National Gallery, London WC2 (0171-839 3321).
Looked... Under your bed for treasures. "Under The Bed Sale" is a godsend for skint art lovers, offering a variety of artworks priced from pounds 1 to pounds 200. To Feb 7, Cupola Gallery, Middlewood Rd, Sheffield (0114-285 2665)