You can get some ideas from the things I have written below
Name your characters and describe what they look like
Why does that character have that facial expression, is it happy/sad?
What objects are there and why are they there?
Do they have any friends who they play with?
I would prefer to use a document such as an id for proof of identification, I think this because although face identification may be quicker, having physical documentation of who you are is much safer and has much higher rates of success when identifying someone.
We might be able to just tell me what the question is and which story :)
