To eat potatoes, seems to work!
No that is impossible. You cannot gain muscle mass without ever gaining weight.
By controlling your diet.
no,you cannot
no
One thing that may increase the size of your breasts is gaining more weight.
ur a woman.
No, maybe rounder. But gaining weight -typically- would make one's head look smaller, due to the increased body volume in comparison to the head.
Yes.
You have to have a round face. Or try some blush.
Some wrestlers, for example, eat certain weight gaining bars to go up in weight class.
squat thrusts and hip ABductor exercises!
Implants or you have to add the fat.