Here's a look with a sort of Audrey Hepburn style to my eyes. She usually had quite thick eyeliner on top and just a little bit of the dark shadow under the eye, just on the outer corner. I put the shadow on the bottom with a small slanted brush and made sure to blend it so it doesn't look too dramatic. From pictures I've seen it looks like she usually used more natural colours like browns and neutrals. For this look i used natural warm colours for all the makeup i was wearing so it would all blend nicely together.
The colours for eyeshadow i used are:
~Medium -french vanilla by covergirl
~dark -matte dark brown
~highlight -matte white (put on lightly so its not too white)
~just a tiny bit of black shadow blended on outer corner of eyelid