I sometimes get this same look from my grand children. The children tolerate us with our "shoot everything" habits well. The light is very nice and even for this shot, no harsh shadows at all.
What a cutie! Two quick suggestions, crop tighter, only seeing a part of the bow is distracting, either lose it all together or make sure its all there. Other thing, watch the background. Hit an angle that gives her good sidelighting but looses the extra blues from other uniforms in the back.
I love natural poses. I think those give you a clearer glimpse into one's soul. This is so cute! I love the slight smirky. Great job catching those big eyes too.
The softness to this is appealing and her smile is a smile you can't get naturally in a studio, which makes this a great, somewhat intimate shot of this young girl. Very well timed.
What focus method were you using? It looks like it grabbed the shirt/hair instead of the face, which is why it has the soft feeling. This happens more often when you use a multi-point AF instead of a spot-focus method.
Having said that, this happens to me all the time. Cameras tend to hate getting eyes in focus when you're doing quick shots. :/
This looks almost like a candid moment with the smile you captured. The contrast on lower third of picture pulls my eye down from her face, although I'm not sure what could be done about that.
Great expression, nice candid feel. Focus is a little soft and the saturation is a little flat -- probably the lighting and maybe that couldn't be helped.