What should the incision look like after a tubal ligation?

Usually tiny. The incision after a tubal ligation depends upon the technique used: laparoscopic tubal about the size of a dime, the same as diagnostic. Laparoscopy; postpartum tubal about the size of a quarter; vaginal tubal ligation even your gynecologist won't see it; placement of the essure intrauterine device will not be visible except to a radiologist;.
It depends. It depends on what kind of tubal surgery you had. If you had a laparoscopic sterilization surgery, you will generally have two small incisions, each about 5-10mm. One will be in or under your belly button, and the other is usually above your pubic bone.