Once upon a time, 'large breasted' was highly valued, because it implied you were eating well, and thus would live longer and potentially bear more children. But in our modern age, with rampant obesity, I think the pendulum is slowly swinging the other way. Although men--as usual--continue to fight it, small breasts imply someone who's physically fit (breasts don't develop as much fat if a woman is physically active during their pre and teen years). When I see a woman with huge breasts, my first thought is "I wonder where she'll be in twenty years? Flat on her back, surgically reduced due to health reasons, or suffering from cancer, heart disease and diabetes.
Personally, I'd prefer having a woman who can keep up with me, rather than one who looks good in pictures shared by strangers. I don't like sharing my women, so I frankly don't care what others think about their breasts.
That said, mine is a decidedly minority position. While the vast majority of professional models are tiny, most women pursue large breasts for most of their lives.