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Toys are great for this sort of thing. All those details that perhaps don't quite come together from looking at a movie still (which I downloaded plenty of) or looking at the comic, where you may be perpetuating someone else's error.
For those interested in the toy as a toy I have to say that it has very few points of articulation. Nice collectable, tho, and as I said, made a wonderful drawing aid for the project. I have since managed to break the blade off the chainsaw (oops!)
As for the skull behind Ash, every artist should have one of these. Very useful.