White card board reflectors should give you a good idea if more lighting is going to the main fix.
Of course, as with everything, the final answer is always going to be mostly one thing but added in with lots of little small other things.
I have heard of major differences with using a graduated gray scale background and as well as having something referred to as a "white balance card" to tell the camera what to use as a reference but it has been too many years for my addled brain to dreg up the details anymore.
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The Zombie Apocalypse is Upon Us.
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