I feel like the only problem I have with the look of the show are the breasts of some of the girls. Vivian in particular seems weird. Someone who exercises as much as her would have a much more toned chest and probably wouldn't suffer from what I can only call flattening of her breasts. Not that she's flat, but they are. Which happens to someone whose breasts are drooping too much. I feel like she should have a much firmer bust line (more similar to Katherine).
I also feel like some....remodeling should have been done to her and Dae-un when in clothes to make them appear more "controlled".
The first chapter we barely see Dae-un below her upper chest, so by the time I got to the second and she was in that pink shirt, her chest was a shock. But what was more surprising was the type of shirt she was wearing with no evidence of a bra holding them up. Then Vivian's massage scene, wearing a bra, and they were still hanging as low as they would without it. The Dev shouldn't be afraid of making two separate models for larger breasted characters. One where gravity in play, one where it isn't. So that you can give the illusion of wearing a supportive garment like that.
In real life I like to call it "The lie all women tell." Flat women wear padded bras to look bigger, women with large but sagging tits wear push ups to look like their breasts are round. When your models are wearing clothes they should look like they look realistically different to what they look like naked, especially anyone with chest issues to one respect or the other.
Seeing Vivian in a sports bra in Day 4 also seems off, since they're still hanging lower even though most women pull their breasts up so they're compressed by the bra when exercising.