Note the whitish belly area of this female. Underparts are interindividually variable, and I have also seen females with much less white on the belly.

Compare with the color key in Isler et al. 1997, fig. 12 (k), (l) and (m). My impression was that some local females are similar to (m), like the individual on the photo, while others looks more like a paler version of (k), or (l).