The x-ray in the centre clearly shows the join and split in the panel, and the wooden blocks and inscription on the reverse. Incised circular lines are evident in both the x-ray and the infrared reflectogram on the right, and the small hole made by the point of the compass is in the ear at the edge of the lobe. The infrared image shows fine lines of underdrawing in the face and the paint does not exactly follow these drawn lines. The lines in the ear appear tentative, as if they were traced, rather than drawn freehand.
© National Portrait Gallery, London