You have a heart face shape if: you are wider at your forehead then narrows below your cheekbones and your chin is defined and pointed.

Facial Features:

Wider at the forehead
Usually defined cheekbones
Tapered narrow chin 

Oval faces have a narrow forehead, wide cheekbones and small chin.

This shape has perfectly proportioned and balanced features.

Facial Features:

Wider Cheek bones
Narrow smooth jaw line
Narrow forehead

You have a square face if: the sides of your face are straight and your face is as wide as it is long.

You have a defined square jawline and your hairline is probably straight. 

Facial Features:

Square shaped forehead, cheekbones and jaw line are the same in width.

A squared jaw line.

You have a round face shape if: your face is as wide as it is long. 

Even if the two measurements aren't exactly the same, but close, your face will be classified as round.

Facial Features:

Round forehead
Round jaw line
Fuller wider cheeks
 

Your face shape is the starting point for achieving a perfect hairstyle, cool eyebrow shape and incredible makeup.

If you’re not sure what shape your face is, the easiest way to find out is to pull your hair back off your face and look directly into a mirror.

You can use a crayon or lipstick and draw on the mirror following the shape of your face.

Now stand back and you should see your shape clearly.