Well...I can see you are getting there with the darks...but go darker
with the girl on our left! Not the skin...the eyes and brows...however the inner brows are a bit too solid and start a tad further back, The girl on the right...the brows are closer and a slightly different line on the photo...I don't mean closer together...I mean the distance between eye and brow
Otherwise a fine job! Don't forget the girl on the right has a lot of darks in her hair...and the opposite for the girl on the right. Pump up the contrast a lettle more.... It's a good exercise to see the photo and ref close together, half-close your eyes and look at the tones only!