Rui,
I think this is a good composition. I would, if you have not already, put your wife back into the same spot (replicating the conditions as best you can) and get a closeup of her face.
I would set your camera to over expose the scene because of the backlit condition. If you don't have a spot meter option on your camera just open it up a couple of stops. This should give you a little more information regarding her eyes.
I might also clean up some of those very dark values around her head. Maybe some variation of the following.
Good luck.
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Mike McCarty
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