Semag is right. When you start to lose weight, you should find a difference in your face too. Also, if you work your upper body, this should give you a more defined neck, jaw and face.
I wrote in another post somewhere about jaw exercises, which help. Regularly work your jaw muscles by clenching your teeth together (perhaps bite down on paper or something to protect your teeth).
This time last year I had quite a young, cute and cheeky face. But since losing weight, working out and using these jaw exercises, my features have changed rather dramatically and for the better. In fact, the change shocked quite a few people.