Unique or my own Color tones

Well, I don't think that I'm a beginner but I faced the huge issue in my career life. I usually shoot pics and then edit them in Lightroom. But I just control the basic things mostly. Colors? I just use saturation, vibrance, and etc. I start to realize that photographers have their own colors for their photo works. Mostly, they know how to retouch color for portrait and have distinguish color tones like a color film. I have no idea how to retouch colors for portrait especially for the skin tones. And I also don't know how did they create their own color from Lightroom or Photoshop. I believe it's important to understand the idea and pursuit what I need to do. So I'm here to get help about the color itself. How should I start first?

Here's a video on correcting skin tones (without having to resort to CMYK):

 

Low Rez (YouTube)

 

High Rez

http://digitaldog.net/files/SkinToneVideo.mov