heheh that is the secret of Beauty Care Type advertisement. This one might not be a beauty skin model but the same techniques are used. This can be archieve by pre-shoot makeup to conceal flaws to the skin using very good concealer makeup and using very natural light makeup. Then the photo shoot itself is carefully shot or maybe I should say carefully illuminated to hide any skin imperfection to smooth out the skin further and the most important part left is the magic of "Photoshopping"
There are some really great artist out there that can "face paint" in photoshop so well that they literally rework the skin complexion even if the make up and photoshop was less then good enough to conceal all the skin flaws or discoloration.
For a long time now...Japanese Photo studios and those working with female models type ads or magazines and even soft porn takes great care to work out every shot to perfection. I recall 10 yrs ago I came across an ad feature a basic background and very specfically placed spot lighting on just two pills. It took 3 days just to get the lighting right. Okay that was before Photoshop and Desktop publishing. But just imagine what it took then to do it.
Part of the saturation of colour is, if I am not wrong.... and something I use to shoot with are using Fuji slides. Unlike Kodak, I alway find Fuji slides very good with colours saturation and shot with Japanese cameras. Some folk don;t like using it as they say it is too atificial but for me I love it! heh They have nice colours saturation...looking these pictures there is a strong indication they are not shooting digital but are shooting slides. That is just my two cents....