Really great idea. However, I think that for this to be really successful you'd have to make it more obvious that the deer is stupefied because it is caught in the headlights. Because, without your title it would not have been obvious to me what was going on.
I suggest maybe adding if you had a single or a double slightly transparent circle to simulate headlights
I really love your concept though and think your design is incredibly detailed. It's a great expression and has lots of texture. Good work :)
About my design
I used the navy color shown as it appears on the template photos. Other color options include Dark Grey and Black.