Well, you should know that there is nothing to do with what brand of sunglasses, but with what kind of frames you will choose. It is really important to choose the right frame for each face shape. In your description, you have the square face. For square faces the goal is not to find hard angular lines that will accentuate your strong features, but to soften them with oval or round frames. So I think you can just wear the sunglasses which have the oval or round frames. Besides, except for the frames, you should pay more attention to the color of the sunglasses too. Anyway, just go to the store, there are professional persons who can give you perfect advices depending on your own condition and your needs.