Sometimes you have plump, not so attractive woman (not attractive, not quite ugly, but also not plain) in manga who at least have the foundations of a beauty ( in other words, they could have been a beauty but life choices, stress, etc. got in the way).
Then you got the ones who are still attractive despite being plump (plump but their body features actually compliment it).
Sadly, I can't see either of that in her.
A big forehead isn't necessarily unattractive, it can actually be a charm point (Takagi [Takagi-san], Robin [One Piece], Tsuruya [Haruhi])...but it depends on how you use it. In her case, with her hair back like that... it looks like a receding hairline (and actually could be). Him giving her more volume so that it reaches over her forehead improved her looks greatly. Rather than her body, he should thin her eyebrows. the only thick eyebrows I approve of is the cute little ones they usually use for fox or bunny girls.
And damn....I put way too much thought into that. Reading while sleepy is scary.