a great idea, but i'll agree with the comments about over-sharpening. all the textures become distracting, and make the image shallower, until it becomes about the surface texture of the image, rather than what the image contains. i think a simpler composition, without the tree, forcing the viewer to really look at the girls, might have served you better.
A good concept imaginatively shot. Seriously over-sharpened however! The colours are washed out as a result of your camera (a trip though PS or equivalent could make a difference but not enough of one) and I think that a greater focus on their expressions in a simpler setting might have proved more effective.