Not exactly glow up but I truly loved it. It is about accepting oneself and loving it and knowing that everyone one has at least one thing the other are jealous of and want it for themselves. The relationship between the girls is so beautiful ( there is also romance but imi it was mid)
https://www.mangago.me/read-manga/200_lilac/
I haven't read this personally but it was always in my to read list, it's is about glow up as much as I know, and Also heard it is good https://www.mangago.me/read-manga/kuragehime/
Also this https://www.mangago.me/read-manga/the_man_who_cleans_up_makeup/

I wanna read something about a girls glow up journey, like I want it to be realistic with tips that can be applied to real life (pls not true beauty)