To get a good smoky eye, use moisturizer or primer on the lid first, and use the right makeup brush. A medium round brush is best for adding eyeshadow to the crease and just above it.
For a smoky eye, use the desired shade of gray, and add it to the arch above the crease. Blend this color to the lash line. Use a dark eyeliner, preferably black. For the lower lash line, add a different shade of gray to enhance the smoky eye.
Thick, black mascara is best for a sultry smoky eye. Adding some color is also appropriate for a smoky eye, including a dark blue or purple.