Learn Photoshop's pen tool:
This is my first "vector"!
Quotation marks because it's actually a raster graphic.
I started it when the first Equestria Girls trailer came out, but I didn't finish until just now Cutie mark vector by *BlackGryph0n. I was in a hurry to finish today. Edit:
I just went to check for any other vectors like this, and I found like THREE others, even better than this one!
I swear they weren't there when I first started ;-;