Thanks for asking... I have been asked many times to write and again this past year, I was approached by a NSW Government School (TAFE College) to make some training videos.
I've decided to just spend my time painting..
You are right about the increase with the beauty industry. Fox studios had me set up some airbrush systems almost 8-10 years ago just for make-up and I've set up a few portable 12 volt compressor systems in the past couple years, for the make-up artists, as they need to touch up between shoots..
It was explained to me that the quality of the images produced by this new generation camera and software, shows every flaw in the human skin, thus the need to fix it before the shot.
The most popular airbrushes used by special effects were and pretty much still is; Paasche "H" and "VL". for make up it's all over the place. Sparmax compressors are the biggest sellers here (Iwata just re-badges the Sparmax compressors) .. for the actual make-up everyone I know uses 0.3-0.35mm gravity feeds, and everyone figures the brand brush they use is the best...lol...
Take care and read your PM