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Generally speaking it's a good picture.
The shadows in my view have to be accentuated as too much soft.
For such type of pictures there's a specific and helpful filter called Portraiture which provide a valid support. This is the site: http://www.imagenomic.com/pt.aspx.
Hope it helps.
Ed.

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This will sound like everything is wrong, but snapshots are one thing, and portraits another. It's commendable to even attempt portraits, as there's nothing tougher.
First, you were using Aperture priority, but didn't use a wide lens opening to throw the background out of focus.
You centered the subject which is rarely if ever best, but you did leave sufficient space to Crop, which is great.
You could have used your flash to provide better lighting. All today's cameras will fill in with just the right amount of light to match the daylight exposure. It would have improved the eye lighting and added catch-lights. Eyes are the most important feature in a portrait, animal or human.
The harshness of bright sunlight on a face is rarely a good thing. Full shade was only a step away. Best portrait lighting
is a bright overcast, outdoors, and North light (no Sun) through white sheers gives excellent modeling, indoors.