I am spectacularly bad at this. If I ever witnessed a crime, the police would be shaking their heads at me. Eyes? Yes I think they had eyes. Maybe also a nose? Not confident but let's go with it. BUT I suspect that most people are like me and it's a brilliant idea to build a game around. Also very well suited to the 20 second time limit. I'm pretty sure you could expand this into a commercial game if you so desired.