Subjective Grading Dilemmas

In John Caden's Draw-Write-Now  assignment, usually his drawing turns out very similar to the one that is pictured.

 

 

But today, I was quite surprised to find the following:

 Alligators? I'm not seeing the connection with owls. So do I give him a deduction for not sticking to the assigned drawing or give him extra credit for creative thinking? Or should I be concerned that his drawing might be reflecting an inner emotional disturbance and make an appointment with a child psychologist asap?  I think I'll just hope that he was simply being a boy and was merely wanting to add a little action to the scene.