Re: New live action "Turtles"?
Re-booting TMNT to make them look more "realistic" is walking a fine line. The turtles, in all of their incarnations, never really looked like what a giant mutated turtle would look like in the real world. Accuracy wasn't exactly a concern. So trying to re-vamp the turtles' look to make them really look like giant turtles could really screw with any sense of nostalgia that the fans had for them. Ya know, kinda like turning Bumblebee into a Chevy Camaro... but anyways... I think the live-action turtles looked really good in the first film. Maybe start there and then make minor adjustments to make them look a little more realistic without completely transforming their appearance.
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