Ahhh faces... the most difficult part of a human body to convincingly reproduce. Since we use faces to recognize people much more than their body's, there's little room for error if you want to create a good likeness. Still, for someone who claims to have little experience at them, this is a great attempt.
There's two things that i'll point out here:
1) Check out the right side of her face (our right). In the photo it's pretty much straight down from her forhead until her cheekbone, and then slanting inwards to her chin. You've created much more curvature than is really present in your sketch. Next time you start on someone's face, try sketching out the very basic lines and shapes first, and then build up on them. Proportions come incredibly easy to me, and I rarely ever start a drawing with sketch lines to build upon. I usually just go straight into detail from the second my pencil touches paper. But with faces, I always have to start with a lot of rough lines and shapes to get the proportions down. If even one part of the face looks out of place, it can appear like an entirely different person to the human eye. That's how much attention we're used to paying to faces.
2) Getting eyes right is a very difficult technique to master, and will require a lot of studies based on this facial feature alone. Showing slightly too much of the pupils can make the subject appear crazy, whilst showing too little can make them appear sleepy. One of the most common mistakes I see is people misjudging the distance between the eyes. A rough guideline is to to have the space between the eyes equal to one eye's width. So that if the subject had a third eye, it would fit perfectly inbetween the other two, just touching their edges.
Hope this helps you out. Like I said it's a really good start for a first attempt, and with enough practice you can have this technique down in no time at all. I'm always impressed to see someone trying something that isn't anime or manga on this forum. Kudos for seeking out proper anatomy skills.
-Silver-