Markings on a horse are usually white marks on a dark base colored horse. The markings never change from birth to old age. Even when they shed the markings don’t change. Some face markings can make the eyes blue or green, even though they are almost always dark brown.
Star: A white marking shaped kind of like a diamond in between the eyes and could be above the eyes.
Stripe: Also known as strip or race, goes down the middle of the forehead to the nose.
Blaze: A wider strip down the middle of the face.
Snip: A white markings on muzzle.
White face: Or also known as the bald face, is a very wide blaze that could be just before the eyes or past it (Making the eyes bright green, white or blue).
This picture of a paint below has stripe marking on his face.
Stocking: White markings that comes from the bottom of the knee and down.
Sock: Or also known as mid cannon or boot, starts from the top of the fetlock and down.
Pastern: Starts below the fetlock and down to the hoof (Doesn’t include hoof).
Crown: Or also called Coronet is a white marking band that usually doesn’t go higher than an inch.
There are more kinds of markings, but these are the basics. Body markings come in all kinds of shapes and sizes from spots to patches. You can even see the skin color of black to pink through hairs of the markings.