Step 1: Flawless Foundation
The most important part of the whole process is getting a flawless and milky complexion. Apply a matte and relatively covering foundation that will even out the tone to create a perfect base. Try something like Clinique's Superbalanced Makeup, which will provide hydration while making your skin look milky soft. Make sure you apply an even amount to the whole face, so that there's no difference in shade or shine.
Step 2: Chiseled Cheekbones
As you've evened out your skintone you need to replace the contouring and highlight cheekbones. Take a subtle pink blush and using a circular motion, apply to the apple of your cheeks where they'd naturally flush. Next take a highlighting bronzer, such as Bobbi Brown's Shimmer Brick, and use an angled brush to apply a delicate swoop upwards along the jawline; this will very subtly create the illusion of chiseled features while not making you look like you're 'overdone'.
Step 3: Bambi Eyes
The most important part of this look is getting the eyes just right. They should be innocent and sexy in equal measures, allowing you to flutter your lashes and look upwards through heavy liner to make hearts melt. Apply a neutral beige eyeshadow all over the lid to create a flawless base to start from, followed by a dark brown shadow on the upper lid - black or grey is too harsh for this look, but brown will bring it all together while complementing your skintone. Start from the outside in using a rounded blending blush, applying a little amount and blending it out and upwards to create the smouldering effect Audrey is famous for. If you're feeling extra daring you can also apply a little amount to the lower lid, using your index finger for precision. The Urban Decay Naked palette is perfect for this look, including all the shades and tools you'll need.
Step 4: The Eyeliner Flick
Without a flick this look simply wouldn't be complete - Audrey is almost as famous for her flick as she is for her fringe, so you need to get it just so. Use a brown liquid eyeliner such as Stila's felt pen, pulling the corner of the lid taught to get a good grip on the lash line. Work from the inner corner by drawing a fine line across the base; build this up in small sections rather than drawing a whole line, as it will be easier to control the width and smoothness of the line. On the outer corner draw a subtle flick that goes from the edge of the lid and upwards by no more than about 0.5cms - drawing down will make your eyes look sad, while any longer will start verging on comedy makeup.
Step 5: Sixties Kiss
Bring everything together with a powerful red lip that'll be the envy of any Mad Men character. Go for something with underlying orange tones to get Audrey's look spot on, rather than blue tones which will be too strong for her subtle kiss. The shade should ideally be 2-5 times darker than your natural lip colour and applied with a brush to ensure precision; start by drawing the outline of the lip, filling it in with colour when you're satisfied it's perfect. To help the colour stay as long as possible, blot on tissue paper and apply another layer of colour (the classics are the best,) while topping off with a layer of Lipcote to keep it in place.
Voila! You're ready to go eat breakfast outside Tiffany's.