She's a pretty girl and you've drawn her great!! I read the comments about where her hair fades out from the photo, I wonder if it might be worth cropping an inch off the top of the drawing to take the attention back to her pretty face?
Lovely. I almost want more of her head but you've drawin enough to show that she is very pretty. Be careful with her right eye (our left), irises are to be perfectly round. Your sister must be very happy with this. I got a little picky with you today, sorry. It really is nice. I would be very happy to draw such a portrait.
It's wonderful work , thought i would like to see at least very light hair drawn at her head top , or going down forehead, it looks a little weird (like she's half bold) , though everything else looks great , she's very pretty ^^