Stop. No really STOP chewing with your mouth open. (What are you 3?)
Wear Shoes that fit correctly. Toes hanging over the end of your shoe is very unattractive. (And kind of gross)
Stop wearing Bra's. Seriously it's bad for you.
Always err on the side of longer hair. No man (Regardless of what he tells you) likes short hair.
Stop coloring your hair with wild crazy colors. Normal colors are just fine. No need to attract attention to yourself. Your natural beauty will suffice.
Please just stop gauging. A few earrings are fine. This is just unattractive. Period.