You've managed to put a great amount of different feelings into this piece. On one side there's a dark, gloomy colour scheme and and sharp edges on the background. On other side a soft, ambient lighting and a cute child model. And you made those two sides work together surprisingly well.
The model's cuteness cannot be denied, yet this particular stock photo is so overused it strips the piece of some of it's impact. I've seen it used countless times before in many configurations that no matter how creatively it's used I can still recognize it.
There's also a minor flaw in the perspective. If you look closely, you notice the roof is sloping downwards, yet the girl seems to be leaning forward, threatening to fall off the roof. I'm pretty sure that was not your intention.
Yet still, it's not always execution but the idea and creativity behind the piece that create it's potential, and in those terms your piece is not lacking at all.
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