Lisa,
Because this is a profile portrait, the ear and its surrounding area appear as a focus point as well as the facial area. More details need to be added on ear and hair area behind it.
Color harmony is very good, add more highlight on shoulder area (both cloth and skin). Background area on top of the hair where highlighted does not need to be darkened, instead, you should lighten it, so the hair would appears more loose and bright.
Still, it is a well done, renaissance style master piece, I really love the color!
Genway Gao
