How can I ensure that my skin tones are "correct" in Lightroom/ACR before I start my retouching workflow in Photoshop? In other words, how do I know that my global color balance is correct (right color temp, right cyan/magenta) before I start smoothing out skin tones? Is there a rule-of-thumb location I can select on a model (e.g. properly-lit midtone on forehead) that will tell me if my color balance is overall "correct" for the particular model's unique skin tone?
Again, I'm looking for setting the stage before I jump into the retouching aspect.