Great picture. Ah, yes, I have used anatomy estimations in the past; chin to crown 7", elbow to wrist, hand width; a variety of estimations based on 5'6" Somewhat scientific, but lacking specific, which is why I like the picnic table; known dimensions. The thing I was lacking was a calculator for what I wanted to measure. I tried cylinder with a dome top, a dome calculator, and, of course, a sphere, but, in reality, none were really the shape of her breast. Thinking about what we have been debating and not satisfied with my wide range, depending upon shapes, I finally found what I was looking for in a partial sphere calculator, which best suits the actual breast shape.
I agree, it is a lot of weight and perhaps more than reality, and her movements on flat land seem to defy much weight at all, however, Beshine's posture and strong legs, as well as a tight abdomen, do indicate she has adapted to carrying quite a bit of weight. Using your numbers, her volume would be 14,695. In the pictures where she is on her hands and knees, her breasts hanging and naturally become somewhat elongated and I measured the projection at 15-16" (with the top obscuring a clear starting point) and a diameter of 12", however, that stops being a sphere.
I must admit, it is all over the place because an inch here and an inch there makes a huge difference. Just trying to get some degree of closure on the subject. The fallacy of using anatomy estimates is that they are precisely that; estimates. I am 5'11" and my forearm to wrist measurement, arm extended, is 9.5", thus my choosing a table. When I used the 7" mark of chin to crown of forehead that is normal for a 5'6" woman, I got similar results.
We may both be wrong, but I have to think, when going to the gym and holding a 90 lbs., barbell up against my chest, it is heavy, but not overly so, especially when I am leaning back and letting it rest more on my chest, pretty much like Beshine does. If I started out lighter and had to do it every day, I'm sure it would get nothing but easier. And not for a minute do I suspect Beshine's breast weight is not substantial.
But, alas, we may never know the truth. If Beshine is reading the thread, I hope, when she gets done laughing at us, that she pays attention to my first post of the day regarding photography; I always want Beshine's facial beauty to shine through, which certainly less than optimal choices have hindered previously.