I use Adobe Illustrator, which is a dedicated vector program. It has the ability to make strokes, which Photoshop lacks. With a stroke, you can make lines without having to draw both sides of the line, making the whole process much, much easier.
She looks like she's thinking, like "You know that could have gone better, but considering the circumstances..." Awesome series by the way. Its nice to see people vectoring season one, good change of pace.