A style that is slightly longer than the chin, shaped and softened around the edges, flatters a square face. This gives the illusion of length to your face. Hair should not be cut shorter than, or in line with the chin, as this would make the face appear squarer. Avoid center partings and straight bangs. For someone with a heart shaped face balance between the forehead and chin is very important. Layered hair shaped along the face near the chin, thick at the bottom and with layered bangs will provide fullness where needed. Straight styles, which cling to the face, would accentuate the narrow jaw line and is not recommended.
The overall style is what makes your hairstyle a punk hairstyle though the color and cut influence this style. The most well known hair is the Mohawk. The flyaway is another traditional style, think of rock stars from the 70s and 80s. Other factors to incorporate in the hairstyle include spikes, unexpected parts, loops and braids. Generally punk hairstyles require a huge amount of styling products. This causes more hair damage so deep conditioning treatments will be necessary to keep your hair healthy. If you are experimenting before finding your punk hairstyle then you should use temporary dies that will wash out and cause less damage to your hair.