There is the fairy tale and then there is the practical; I suppose anyone could like either, but only one dwells in the real world. Even in my pragmatic way, I would still choose a size that exceeds rational expectations of the body to carry the weight, mixing in the fantasy of breast lite, the fractional weight of real breasts. Ms Muse introduces three subjects and while I can say that all are appealing shape wise, #2 exceeds the realistic bounds in size and function. Numbers 1 & 3 are both excellent and I can imagine the naked, unsupported breast that size and shape being handled in every day living.
The problem with morphs is that they often lose the three dimensional aspect of the breast. Taken from a portrait view, you tend to lose the appreciation for sideboob and overall width, leaving the viewer less concerned with practical aspects, if they were inclined to think of them to start. I believe that I tend to look at breast size from the aspect that Beshine does; aware of all the ways her breasts obstruct normal functions of the body and absolutely loving the experience in numerous instances. When we examine the three morphs, one can imagine that one of the most important obstructions, reach, is compromised relatively the same; the projection is at the limits of her reach, meaning, as Beshine reaches out for something, her breasts are likely to be contacting the object or those slightly closer at the same time. In the 3D world, reaching around her sideboobs to reach something in front of her is not possible, so it is done as we see Beshine do it today; elevating her arms and reaching over her boobs. We also see Beshine employ turning slightly to move her sideboob out of her way to reach with one hand. These are the practical aspects of reach with huge breasts that project both forward and sideward. Though all 3 suggest her sideboob, #1 also makes it visible how Beshine's posture allows her arm to fall behind her sideboob that tapers to a point near her back.
I have to imagine that one of the less desirable problems involves reaching for things below hip level. Despite having very strong legs, you can see Beshine's effort to stand from a squatting position and she seemingly always needs to use one hand to steady herself. This is a departure from maybe 5 years ago when the same move seemed to involve less effort and needed no support for stability, which is just another indication that her breast weight is measurably increased. Looking at #1 and #3, we can imagine those able to actually squat and stand; #2 would have difficulty standing from a sitting position, because either motion requires leaning somewhat forward to accomplish and if your breasts are pressed against your thighs too much, that is a problem.
While it is totally subjective, I would imagine that the breast weight limit for the average girl of Beshine's height and strength to be maybe around 130 pounds, and less if she is to enjoy her size without excessive struggling. Translated to volumes, I suppose that would place each breast in the 20k to 30k range. Just speculative estimates, but L to R, I would guess these morphs to be 50k, 100k, and 35k.
In regards to the ability to carry such weights, despite the fact that these morphs are from original pictures of earlier years when Beshine was considerably smaller, you can appreciate the fact that even then, she had already adapted the excessively upright posture with her shoulders well back; this stance has only increased as has her breast weight. It is also this posture that allows her to carry such weight, while not effortlessly, but with a sense of grace and agility one would not expect, which is why some may think the weight is less than it really is.
But for anyone liking the idea of, as Beshine calls them, "big boob moments," where her boobs inhibit or obstruct normal function, there is no comparison of fake to natural breast shape; the higher and rounder breast will always create far more of those moments that Beshine professes to love. And if we compare the ability to carry equal weight in either shape, the higher placed weight, while causing increased balance issues as well as line of sight, is by far the easier. If anyone wonders about this, simply pick up a bag of cement and see if it is easier to carry against your chest or at or below waist level (you will also naturally experience the same shoulders back posture to compensate for the weight).