Good shot - I really like the pose!
I wonder if you could selectivly bring out more light in the eyes and nose though = they are a little dark.
Also, I agree with poppy - I tend to underexpose during the day under the sun almost all the time - and then edit the shot back up later (RAW mode helps) as it is far easier to add light to a shot, but taking it away often does not work as there is not details in the whites to reveal.