The concept is really nice, you've put a lot of thought into it. I also love how you're trying to get attention towards the subject, which is a really good aim.
I like your use of shadow, though I miss the father's shadow on the floor. But besides that, keep up the good work!
Oh you are completely right, i did forget the drop shadow, thank you.
Nice idea, you should work a bit on the anatomy of the running kid. The arms and hands are a bit off.
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