That's pretty much how I did it. The trick is to line it up, so it matches everything else. Or replace the whole strand of hair.
I can't see if you did it already, but you can get a pretty big piece of the screentone from the other side of Yotsuba's head.>>3290990
Looks good. I would go a bit darker in the middle.
You can also make the light more saturated at the bottom and lighter at the top to simulate glow.