Amyby
rayg544Comment by sfalice: Greetings from the Critique Club
You are lucky to have such a photogenic friend, who doesn't mind posing for you.
My suggestions for this very nice picture generally follow the lines of your other commenters. Crop each side into the shoulder and even just a tiny bit at the head. This would take away some of the feeling of a 'snapshot'.
If you redid this portrait, I would suggest less depth of field to blur out the background even more, or even to select a background that was more neutral.
Again, on a redo, having your subject gaze into the distance, either left or right, could add interest, and by all means, move the camera left or right and "up". Full face is seldom as flattering as a slight side view. A camera angle slightly down will help conceal any less than youthful chin lines.
Finally, I think a diffuser, or piece of aluminum foil reflecting back on one side of the face or the other would add a bit of fill light that could be interesting and make Miss Amy's face sparkle.
You have a great model here, and for someone who says he isn't a portrait photographer, you're doing pretty well for a first timer.