>>15389501You can do exposed armpits just like Watame, Sora and even her own genmate, Bae. The difference here is Sana's clothing is lacks protruding frills/patterns that disrupt the clean open lines of the upper body. Skintight sleeves in a color close to human skin also doesn't help dispelling the illusion that she's just naked. And sheer nakedness isn't erotic, you must tease the viewer instead of showcasing everything in one go. I'm not a fan of her lower body's skirt flaps, either. There are other ways to conceal a one-piece behind the the see-through skirt, like frills or ribbons, and a 2nd-outer skirt doesn't work right.
Also she has no front accessories in her head. The reason vtubers have them is to disrupt the monotony of a singular hair color, and opting for twin tail beads just emphasizes it's plainness instead.
