Hello, Susan,
Nice execution! What medium are you using?
Couple of things that caught my attention. It might be from the photo, but these are what I notice. The left girl's lips on the right side corner are a bit too dark. I think the light is coming from the right side so it should make the right side of the lips a bit lighter.
For likeness, you have captured both of them very well, but the left girl's face is a bit rounder than on the picture. I usually use this trick to see if the proportions are right on the money or not: By looking back and forth between your drawing and the picture, you will be able to see the differences between the two.
I hope this helps. Great work!
