You pointed out lots of good stuff , yeah the client is very traditional with their idea of gender norms, but they’re still the one paying and clearly have their own vision. Part of the job is putting your own belief aside and just interpreting the vision into designs that the client wants (if you want to get paid especially since this is her first lead gig). I feel bad for Kasane but she can also take in what she got as feedback in this chapter, then mix her own experiences as a ‘boyish’ girl, friends advice about tons of drafts, and sell her revised concept in the next review. Even the boss is on her side, he said girls come from all walks of life, they just need to convince the client.I'm interested in how we're reading into this differently. As I see it the client is incredibly prejudiced with old school ideas of gender roles and norms. Which is directly counter to the theme of this manga. She's nice on the surface yeah, but she's happy a woman is leading the design because it's a toy for girls. At the same time she said she didn't like the original proposals for being too "boyish" despite that design having been made from "your own experiences" as advised by her friend. I took the halfway tears at the end and flashback to both scenes to be the contrast between what the client (representing traditional ideas about gender) expects of her as a "woman" and the reality that she just doesn't fit into that stereotypical idea of a "woman".
Since this manga is crossdressing and subverting gender expectations, next few chapters would be interesting in how she approaches the project. Thanks for sharing your perspective too, you got me thinking.