This element of design is Negative Space. The hand isn't actually holding anything. It implies that there is a light bulb in the empty space. Negative space guides your imagination to finish the image.
This image depicts a strong and powerful message of sexual abuse. The black and white colours portray a dark and sad message, and the huge confronting hand against the small legs illustrates the dominance of sexual predators.
I know of way too many people that think plugging things into an app or clicking a button in Photoshop is design. Don't get me wrong, these things are handy and cool but it doesn't make you a designer.