Abstract expressionist’s mysterious painting joins portraits by Warhol, Bacon and Hockney in Bath exhibition

The image of the young boy is so faint that it is easy to miss – but if you gaze long enough he gradually materialises through the warm shades of orange, red and ochre.

This is the first view of a previously unexhibited painting by the great abstract expressionist Frank Bowling showing – just about – an image of his son Richard Sheridan Bowling, better known as Dan.

Iconic: Portraiture from Francis Bacon to Andy Warhol opens on 24 January and runs until 5 May