Many artists leave a flaw on purpose to show that they are not perfect.
As they created intricate geometric patterns out of thousands of tiny beads,Native American women would intentionally string a wrong-colored bead into an otherwise perfect pattern. This was called the spirit bead. The spirit bead was placed in an otherwise flawless piece of art as an act of humility, a way of recognizing the inherent imperfection of humans. Presuming that a human could create something perfect would be an affront to the true perfection of the gods.
The author of "A Primer: The Art of Native American Beadwork,"says that every piece of beadwork must contain a spirit bead,as attempting to create an object of total perfection has always been considered bad luck. Ojibwa tradition also states that the Great Spirit can only transcend a piece of art through this flaw, and thus the misplaced spirit bead provides a break through which God can enter.Link
I try to do the best I can and accept that my skills are limited.I know perfectionists,they don't want to start anything,unless they know it's something they can do very well.Or they sit in a tidy and spotless house because they don't want to make a mess in their house.