The way I would imagine it working would be, you could take multiple screenshots and trace over parts of the character in focus on them.
You could do things like;
~ Approximate the basic shapes that best make up the character
~ Approximate Facial Structure and positioning of features
~ Compile lists of expressions, poses, hands, feet etc.
~ Create approximate height comparison sheets for characters seen together
Then collect the information onto several seperate model sheets for easy viewing.
It'd be great for characters where model sheets were far and few between. Everyone knows tracing is a no-no in the artistic world, but nobody would exactly try and pawn them off as their own work.
Just as an example,
Original Image >> Traced Shapes Over Image >> Basic Shapes
Although I really have no use for a Mr. Crabs model sheet, it shows how it would be done for obtaining the basic shapes of a character.
Well, what does anyone else think?