For life studies in this sketchbook see note to the recto (D10418); a similar draped figure is on folio 6 verso of the sketchbook (D10421). It seems likely that the seated figure is related to the one seated at the base of a brazier in the right foreground of The Decline of the Carthaginian Empire (Tate N00499)1 given the presence of other sketches and verse for the picture in this book (see Introduction).
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed. 1984, pp.100–1 no.135 (pl.137).