This was just an exercise, and maybe it was the cold medication,
or maybe I'm just too old to have a steady hand, but try as I might,
I couldn't get the black parts really smooth. Using the eraser tool
is not the answer. There must be a selection technique that I don't
know about that can smooth (and yes, I tried the "smooth" tool) out
a selection. I finally gave up, and posted what you see here.