I know you're a foot guy, but when it comes to content that shows off Sharon's body, the reality is that most viewers are probably more interested in her ass and other parts. That's largely what I meant by maximizing her strengths when choosing poses and camera angles. That's what will get the most views.
But you're also right about her soles. Regardless of the flaws we mentioned, her soles are one of her strong points. The pose and camera angle you suggested would play to that strength, and she might as well cover as many demographics as she can with a video like that.
I disagree with your assessment about her cankles, though. In Sharon's case, that seems to just be how she's built. She carries her weight in her lower body, so if she loses weight, her upper half will look gaunt and unhealthy before she sees that kind of improvement in her lower half. The only real solution would be liposuction to her lower legs, as weird as that sounds. Unless it's all lean mass, in which case there's really not much that can be done. Either way, I don't know how likely it is Sharon would go to those measures anyway. As for the bunions, they can also be fixed with surgery. That could potentially be worth doing for health and comfort reasons regardless of the bonus cosmetic improvement.
When it comes to Gibi, she gets more views in general. She has an audience which is quite receptive to what she does. Gibi's strong point has never been her body, whereas Sharon has a lot of gifts in that department, and a lot more potential to capitalize on those gifts. Sharon is also conventionally more beautiful, whereas Gibi is more about personality.