Step 1: Paint nails with a black base coat.
Step 2: Paint on the skull shape in white. I painted on a wide stripe, the width of the upper jaw part, first, then went back and added two angled stripes to make the cheekbones and add a little roundness to the the top.
Step 3. Allow to dry completely, then draw on eyes, nose, and teeth with regular Sharpie.
Step 4: Finish with a clear topcoat to protect the sharpie, otherwise it can rub off of the dry polish.
Step 5: Enjoy a little spookiness at your fingertips!