Made this vector with Illustrator instead of Photoshop. I think I'll be making the switch for all future vectors. It's far easier to make strokes when I can just define the middle of the stroke and give it a width. I can also take existing cutie mark vectors and bend them so that they follow the curve of the flank instead of making new ones each time.
Thanks to for making a guide on how to use Illustrator. I would not have known about the variable width strokes feature without it.