Make smoother the transition of the colors, applying the Smudge Tool and make brighter several places, choosing the Dodge Tool:

Miu Miu Anime Girl

Smooth out the shadows on the girl's skin, adding the grey color reflexes:

Miu Miu Anime Girl

Pass to the girl's hair. Select the Gradient Tool on a grouped layer to separate a little the illuminated zone of
 
the hair from that one situated in the shadow:

Miu Miu Anime Girl

Select the Brush Tool to add the flares on the hair (on a new layer also).

Miu Miu Anime Girl

Make a copy of the layer, containing the flares and blur out the copy, choosing the next option: Filter – Blur – Gaussian Blur.

Miu Miu Anime Girl