As you bring the white face paint down your neck, begin applying it more lightly so that it gradually fades into your natural skin color. This will look much less harsh than an abrupt border between the white paint and your skin.
Using a powder over the face paint will help to ensure your eye makeup will not rub off easily. It creates a nice base for the rest of your makeup.
It’s ok if your outline isn’t perfect. The idea of the eye makeup is to look like wings of a Black Swan, so a little bit of smudging will just give the wings a more feathered look.
You can also apply the white eyeliner on your bottom waterline. This will help to make your eyes appear brighter against the intense black. If you choose, you can accentuate the lines with some sparkly silver eye shadow to make the look even more dramatic.