I added detail to one side of the zip. When doing this type of object, I don't count the 'teeth' and make it exact, but I look closely at the structure, so that, when I am suggesting the shapes with paint, it will look authentic.
I hope to complete the other side in my next session.
It is not shown completely in this photo, but the texture to the jacked on the left side of the painting has also been added. It is now beginning to look more complete.

Detail.