Stylistically, it can be compared to other drawings by the artist executed in the mid 1630s, when many of his works were characterised by delicate lines applied with the point of the brush and often with a pale wash. It can be closely compared to A Bearded old man with a loose drapery wrapped around his shoulder, in a private collection.1 Nicholas Turner and Carol Plazzotta, in their catalogue entry for that drawing, describe the technique as 'largely drawn with the brush and wash, with only the finer details such as the facial features, hair and beard picked out with touches of the pen.'2
1. N. Turner and C. Plazzotta, Drawings by Guercino from British Collections, exh. cat., London, British Museum, 1991, p. 131, cat. 104
2. Ibid., pp. 131 and 134
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