Creative idea, but the lighting could have been better. Maybe use a subject wearing a black sweater and then use one or more strong lamps instead of the flash?
It doesn't look like sign language so my next thought is the fingers are creating a box and the intent is to represent the idea of , 'thinking outside the box' (a very overused expression, IMO).
Doesn't work for me, mostly because outside of that idea, it is just a snap shot with very little to hold my interest.
I like the idea behind this. Unfortunately, the lighting is poor. I am guessing you used a top mount flash and didn't use and other light. Maybe next time use softer light that doesn't make such harsh glare and will allow for more detail in the shadows.