Completely from scratch without any tutorials, the only thing I didn't make were the filters used to overlay the ball for texture. This is my very first vector, I didn't use tutorials or any knowledge lending tools, just my wits and by remembering how they are supposed to look like. Original Image Version One: Version Two: Thanks, Jack.
The lines are jagged and the stripes should be a little forward warped on the sides to give it that extra sense of dimension. Also their width aren't consistent. But I know working with vector curves can be a pain so don't take this too seriously. I think you should refine that jagged top-right line and give all the lines a slight outer black glow. work with the second one because there's no need for such a thick outline as in the first.