Looks like early morning or late afternoon lighting here. a little bright area on the nose. I think softening this photo up would make her skin alot smoother and "flatter" the subject more. On close inspection, the right upper corner has painting circles. Blur those up a bit, so they are not as noticable.
A mix of available light and another source - maybe not but the effect of the burnishing on the ahi is nice. The absence of shadows is good, as is the control of DoF. Maybe a crop from the left to the shoulder would work too?