Hair: BasicsBy Rio
The only difference is if it has curves or none at all. Besides that, the trick to drawing hair is how your lines are drawn!
To draw hair that is believable, you have to draw the lines convincingly. To do this, you have to consider the width of a line in relation to another line.
If you look at the other pictures, they pretty much work
the same way. Long hair, short hair, etc. Curly hair, on
the other hand is a bit different...
Curly Hair Disected
Very wavy hair, on the other hand, is a bit different. In this case, the lines tend to be shorter and may start out of nowhere all of a sudden. Notice that there is not just one line or two but several - this emphasizes the curl and adds more volume to the hair.
Frizzy hair has a different trick to it. What you have to do is to create the base curly lines first. These will be the basic main lines on the hair that define how the hair is shaped. (Think outline!) From these basic lines you then add complementary lines that put more depth to the hair.
Take a look at the frizzy hair example - try to find the main base lines and the complementary lines beside them.
Ringlets, on the other hand, only requires that you draw the lines in a cylindrical fashion forming a sort of column. You have to consider that if you draw ringlets you have to make sure that it shows connection as it spirals down to the next curl.
One major point you have to remember is that once you draw a ringlet in one direction - make sure you stick to it! This drawing below, for example, has ringlets going in two directions which completely ruins the picture. It confuses the viewer and it disrupts believability.