An easy way to draw any kind of pony, too.
Step 1: Step 1: Circles, Circles, Circles.
Start by drawing three circles like so, then sketch out the neck, ears, and legs
Step 2: Step 2: Mane and Tail
Pinkie's tail is hard, so it might take a few tries, but if you get it right, it looks really good!
The mane is hard too.
Step 3: Step 3: Face
It might look creepy.
Step 4: Step 4: Cutie Mark