Oval is the face shape that is most versatile. Almost any look will work- short, long, straight or wavy. No what length your hair is, to best highlight the features like your cheekbones or your chin, layers will work best.
Avoid: Short layers on top of the head in any style you chose. If your hair is thick or curly avoid a blunt cut.
Styles that work : Choppy bobs, long waves and shoulder-skimming shags.
The best example of an oval face is Kate hudson.
Other face shapes.