EASY PEASY! 

The makeup style of a Pin-Up Girl is easier than some might think.

Make a wing with your eyeliner. Put some red lipstick on those lips and some rose on those cheeks.

By all means, if you usually put foundation than go ahead.

I personally don't wear makeup except for mascara and eyeliner, so those three steps + mascara would be the only thing I'd have to do for a Pin-Up shoot.

Voila.