Maintain good eye contact with the person you are interested in. Keep your back straight. Good posture can make or break your good looks. Smile a lot. Let your personality shine through.
Personality is ultimately more important to both men and women than a fabulous body.
While accenting a great figure can't always hurt, don't neglect showing off who you are on the inside. Talk about things that you have in common and don't veer off into a self-inflated monologue about one of your obscure hobbies. Though it is important to tell a new love interest all about yourself, let your story unfold naturally, with lots of give and take in the conversation. Don't talk about past lovers. Body positioning should be 'open and inviting'.