I never read the manga and I'm not familiar with any of the cast, so this review is based on everything being new to me as the viewer.

LIKES:
The production and cinematography were both great. I loved the vibrancy and colour palette.
The story concept of art through fashion in a coming of age, school to work theme.
I found the acting of the FL initially a bit over the top (made me think the character was a moron) but she grew on me and I liked her more mid way.
The music was okay, nothing annoying but also nothing stood out.

DISLIKES:
The director failed during some moments with timing, having the FL taking too much time for reactions/actions.
The transformation from high school no-body to beautiful working woman, wasn't as impactful, even though the make-up was pretty.
The supporting characters storylines needed more development, I wanted more storyline from the Transgender/Cross-dresser (Isabelle?).
The high school boy love story could've been left out completely or definitely reduced, since the writer seemed to abruptly conclude it.
There were some red flag moments too, however I understood it was mostly to teach a lesson for the FL.
The family portions of the drama were very choppy, which caused them to loose their impact.
Some time should've been used for showing FL trials and becoming an adult between home and finding work. It all happened too fast.

OVERALL:
The conclusion of the movie was acceptable for the FL and ML, but not for the other supporting characters. It was an easy watch, with not much heartache or drama as the viewer. I would watch it again and recommend it.