Wearing short hair is a good thing because you don't need to have high maintenance when it comes to styling. When it comes to maintaining your hair daily, you'll only need a few minutes on styling. However, if you want to maintain it short, you need to keep it trimmed every month. You can just put some mousse on, style it in any way you want and you can already have that sexy look you wanted.
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.