Sheppard vector drawing

Recently realized I hadn't uploaded this one here, so here it is.

About a year ago I got curious about vectors, so decided to try my hand at them. This is done entirely with the pen tool in Photoshop, which is, yes, completely boneheaded, but it was the program I had, and I wanted to see if it could be done.

I had a lot of fun playing with the smoothness of the curves and altering the transparencies of intersecting shapes. But it took about six times as long as a pencil drawing, so I haven't gone back and tried it again.