Depends how you define the term "Physically Pretty."
I believe that a woman is most attractive when she exudes confidence and in order to obtain this, she must first feel good about herself.
For instance, a woman feels that she is a bit overweight. She should first ask herself, why do I feel this way? Is it because I am comparing myself to the ads of models I see in magazines or is it because I am, in actuality, not at a healthy weight for my height, in which case this would be an acceptable reason to lose weight.
As a simple exercise, find 3 things you love about your appearance and work them girl!
You can be drop dead gorgeous but if you aren't confident in your choices or in who you are as a person--you are bound to turn off just about everyone.
Be proud to be you.