It's all in the details!
What you wear to your session can make or break your portraits! Be aware of loud patterns, colors that might not coordinate, or styles that might really date the potrait.
Jewelry can be a great addition to a portrait, but make sure that it's something you want to see for years to come!
I have found that simple is best. What you want to see and remember in portraits is the person being photographed, you want to remember their face, eyes, expression and personality.