Study for a figure of a muse

A photograph of drawing by Raphael (c.1510) now in the Albertina, Vienna (inv. no.220). The drawing is a study for the figure of the muse seated to the right of Apollo in Raphael's fresco of Parnassus, painted in c.1510-11 in the Stanza della Segnatura, Vatican. In the fresco the figure is depicted holding a kithara, an attribute generally associated with Erato, the muse ruling over music.