Re: How do this type skin color
If you're looking for the exact color on this model, sample a representative area of skin you like (I took a reading from the middle of her nose). Click on the foreground color box in the tools pallet and write down the numbers - I got these - red 225, green 218, blue 212. You can also sample several areas to get a range. When you open a photo you want to work on, click on the foreground color box again and enter the numbers you wrote down. Make a blank layer above your original (blend mode normal) and paint in with a 100% brush only on the areas of the skin you want to affect - it will look weird in this stage, but it's easier to see what areas you've covered. When you're done painting, change the blend mode to hue. You may have to make a layer mask to clean up where you painted, and be sure you didn't affect the rouge area on her cheeks as this will change also.
As for the tonation, the tutorial that Flashtones referred to would be helpful.