I think a good rule to use when you are getting your breasts enlarged is to have them be no bigger than 75% of your head size.
There was some chick in the grocery store the other day and, I kid you not, her tits were the bigger than her head. She had a freakishly small pinhead and these big balloons sitting under it. I couldn't help but look at her and imagine her face on her chest also. Have you ever seen a shrunken head? That's what kind of face she had - low ears, duck lips, fish eyes. And the huge chest ornaments just really drew attention to her tiny head.
It so surprised me to look up and see them headed my way that I actually exclaimed, "Holy shit, Sweety! Do you see those?" while jabbing him with my elbow and I wasn't the least bit discreet about it. Generally, I'm not one to curse in public or let someone know that I'm looking at them but my manners were temporarily stunned.
I haven't been able to get the image of her out of my mind and I hope that by purging myself of the experience that the memory will fade.