Answer: They notice and point.
The word "winks" signals that people are noticing the gesture, while "finger-ends" refers to fingers that are pointing. Therefore, the conclusion is that the people are noticing, and pointing.
"To a Louse" is a poem that describes how an elegant lady in church had a louse on her head, which she was unaware of. It is a social criticism on the idea of class, and the value that people give to physical appearance.