This is, after all, an industry dominated by uniforms. The language of colors deserves a note. Reds assert authority. They can make you feel confident and in control. Avoid red however, if you want others to open up to you.
Blues are a calming color but can reflect a lack of creativity.
Greens reflect concentration and a focus on what needs to be done. Your casual, sincere smile should underline your eye contact, which is steady, inquiring and relaxed. If you are meeting with more than one person, do not try to make eye contact with everyone at once. The general rule is to focus on the last person who spoke. If seated in front of a panel, never let your eyes wander above their heads.