Working in watercolour there are always accidents (some happy, some not) and in this drawing the curvy long S-shaped shadow on the cushion to her right is echoed by the curve of her calf on her left leg and this sets off a whole series of rippling curves in the lower part of the drawing. Above these, in contrast, her head in held very still emphasising her clear steady gaze.
Click image for full view. Image size 37cm x 42cm. Mount size 52cm x 48cm.