Skin can undergo many changes in teens for instance skin produces more oil which causes embarrassing acne problem. You should avoid washing your face many times a day and using highly medicated products. These medications over stimulate oil glands to produce more oil. Make sure to wash your face with a light soap twice per day. It will also be good to add some shine-free moisturizer for skin hydration. Make sure to remove makeup before sleeping.
Mostly high school girls like to use heavy makeup in crazy colors for fun but it looks unnatural. Choose one feature you want to highlight when it comes the time to apply makeup. Use this key feature as a base for you. If you have pretty eyes then do those up and leave rest of your face as natural. If you want to use bright lipstick then use minimal amount of makeup elsewhere.
Hair styling is very important for high school girls. Girls like to have fun in dyeing hairs and use different colors to highlight hairs. Having one signature hairstyle is an easy way to retain your personality among all other high school girls.