I have found the best set of make-up tutorials through a Time Warp Wives link.
Pixiwoo is a channel on You Tube.
The You Tube posts feature sister (Sam and Vic) who are make-up artists based in London.
The sisters have done a whole series on Hollywood Legends (8 videos in all) featuring Marilyn, Sophia and Audrey. Her are some of their results
Warning: Viewing is addictive and you may be encouraged to spend 30 minutes doing your make-up in the morning.
I will post photos of my attempts at following their wisdom!
The girls also have a joint blog: Pixiwoo - Sisters are doin it for themselves