I like the idea of this very much. The left and right images seem to have the same exposure and light whereas the middle one seems a tad different. Other than that - nicely done.
Nice triptych! Good subject choice and viewing is easy at this size. Great expression on the model, especially in the last frame :-) Lighting on the first and last frames look a little stronger than the middle frame.
I love what you've done here - the only nitpicking i'm going to do is this: the lighting on #2 is darker/softer than the other two. (I had this problem on my entry also... don't sweat it) Cute subject, she did a great job for you. :-)
Not the first of these I've seen in the challenge, but the best. Her expressions are priceless. Go buy that girl (or is it those girls?) an ice cream; she deserves it. (well-composed etc. as well. But a good model can be hard to find. :)