That Yumeh suit is so cute!!
I like the airy shirt you have on the first page. I'm actually wearing a similar top at the moment! I would say, though, that you might want to add some more body definition - if the material is thin, it doesn't just hang like a bag like a heavier material does. Thin materials tend to cling and drape in equal measures. Since I'm wearing it right now, I took a picture to give you something to reference:
Link
Important parts to note are that long, diagonal crease from my chest that wraps around to my waist and the bunching down below my stomach. The creases you have seem to accentuate the tummy, while tops like this generally accentuate the waist while sort of floating over the stomach like it isn't there (YMMV based on body type, of course, but we're focusing on the [thin] avatars). This isn't a model-quality ideal photo, but hopefully it helps illustrate the cling and drape for airy tops.
I'll also mention that this is a very thin polyester - cotton clings much more. So if you intended the shirt to be a thin cotton, then it definitely needs a lot of clinginess.