An afro is a hairstyle that you get if you have very tightly curled hair, and you let it grow out naturally.
You are bald if you have little or no hair on your head. Some men go bald as they get older, but other people shave off their hair to become bald. The man in the picture is bald, but his dog certainly is not!
A beard is the hair that grows on the chin of an adult man or animal. Male goats have beards. The hair that grows on your top lip is called a moustache.
Braiding is simply a form of weaving, but is usually meant to mean weaving hair or making a rope. See also: plait.
When you have your hair drawn up into a bundle on the top, back or even sides of your head you have your hair in a bun.
Dreadlocks are like ropes growing in your hair. They form when your hair matts together. Dreadlocks will form on their own if you never comb your hair, but most people encourage dreadlocks to form. Dreadlocks form more easily in people with tightly curled hair.
A moustache is the hair that grows on the top lip of an adult man or animal. The hair that grows on your chin is called a beard.
Pigtails are braids or ponytails, one on each side of your head. Children are more likely to have this hairstyle than adults.