You would sound better if you wouldn’t equate fatness with being ugly.
Stop with the backhanded compliments.
“You have such a pretty face…”
This comment can be perfectly genuine and innocent and not meant to imply anything more then the person in question has an attractive face. But for a great few of us we’ve heard that little trail off at the end, felt the commenters eyes critically burn through our bodies and understood the silent but loud implication; you have such a pretty face, it’s a shame your fat.