'much more beautiful' is correct and usable in written English. You can use it to compare two things, such as "The sunset tonight was much more beautiful than the sunset last night.".
Compared to their beauty their cost is much more beautiful.
We are much more beautiful".
It's much more beautiful than the others.
It's much more beautiful than that".
But that would have ruined a much more beautiful defense.
"Forgive me, you are much more beautiful than she is".
The effect is much more beautiful than it is gynecological.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia