Clothes
Wearing today's latest styles might seem like a good idea at the time, but later you will laugh at how cheesy you look. So stick with solid colors. Keep in mind you will only see the top half of your body so do not worry too much about what shoes or pants you are wearing.
Makeup
Makeup can be tricky since the style changes all the time. To be safe, wear dark, but still neutral, colors. If you apply the makeup too lightly, it will not show up. It is good to pack on more than you think. You can always wipe some off later if necessary. Or if your picture time is not until mid or later that day, apply more right before the picture. Avoid any shimmer or lip gloss because this may add unwanted shine to your photo.
Hair
No matter what you do, your hair will always look slightly cheesy later on. Hair styles are probably (aside from fashion) the thing that will change the most later on. There really is no avoiding it. The best you can do is make it look good. Then this way later you will say, "Ya, I look cheesy, but I looked nice then!"
Additional Tips
- If you want a good picture, be prepared. Make sure you keep track of the day it is scheduled
- Do not try to force a grin. Smile with your eyes it looks more natural, rather than trying to keep your eyes open wide
- Tilt your head slightly down and forward to avoid the illusion of a double chin