In most women, the left breast is slightly larger than the right. Very few women have perfectly symmetrical breasts. A slight difference in size (up to 20%) between the right and left breast is normal.
[NB] I've made lots of comments on everyone's pics & been listening to you all wanting a larger cup. We're going to attempt to make a larger cup & want to hear everyone's input on size. The Frohle Extreme which is the most popular is 4.75" L