Start with a decent camera(: basically anything besides your iPod camera if you can I find they add a lot of discoloration. I use my point and shoot Olympus as seen above and my canon XSI(:
Dress to impress!
Practice smiling; if it looks like you're sick/dying/kissing your aunt, your doing it wrong.
Don't just take photos in the mirror! Set a timer and pose(: or have someone else take the pictures of you!
Take risks and try something different! And of course have fun with it! Usually the photos I take risks on turn out the best(:
Be yourself. I'm a huge dork. And if this doesn't show who I really am, I don't know what will
Edit :D I suggest Picmonkey.com(: even a simple Black and white overlay can make a photo go from good to great!
Goodluck :D pleAse like and comment and follow, I appreciate(: