Here's your tutorial:
Step 1: To center the eyes, I began with two dots in a horizontal line. I tried to evenly space them, as they will be the innermost edge of the eye.
Step 2: Using your dotting tool, begin to dot around in a circular shape. I found it easier to make the same dot on each eye to insure they stayed evenly sized.
Step 3: Fill in the rest of the dots in your circles. Remember, they do not have to touch now technically, because you will fill this in.
Step 4: Fill in the center of your dot circles. I used the regular brush that came in my black nail polish to do this. Leave the dots sticking out the edges so that the eyes have a flower shape.
Step 5: To begin the nose, make a dot centered between the eyes.
Step 6: Make another dot below this as if it were the corner of a triangle.
Step 7: Add a third dot to finish the triangle shape and your nose.
Step 8: For the mouth, begin with a straight line under the nose. I did this step on all my nails before proceeding to insure I took my time on all of them and didn't get lazy at the end.
Step 9: This step isn't technically necessary, but I wanted my mouth a little unique. Here, I added curved lines outward from the corners of the mouth as I'd seen on sugar skulls elsewhere.
Step 10: Using my dotting tool again and fatter dots, I placed four dots above the line and four dots below, forming rows of teeth.
Step 11: This was the most important step to be careful on. With very tiny dots, I places eight white teeth within the dots I made in the previous step. And don't worry, if you mess these up, you just have to redo the black dot under it and repeat. It's not a huge hassle really.
Step 12: Finally, I used different colors to make the flower eyes. I used my dotting tool to go around inside the dots I did before on the eyes. If these are a little off, it won't make a huge difference. Keep a steady hand, though.