Sleeping on your back will prevent many wrinkles and breakouts on your face, and even wrinkles in your cleavage area.
Wearing clothes that are tight make you look heavier. Even a slim girl can bulge over too-tight jeans. Put on a coat of clear nail polish before a colored polish to keep your nails from discoloring. Being angry really does take away from your beauty now and will result in more wrinkles later. Wearing less make-up makes you look younger.