A general rule of thumb is to dress as if you were working for the organisation while erring on the side of being conservative. Mannerisms and demeanour also contribute to your projected image. Have good eye contact to facilitate the communication process without staring at the interviewer throughout the interview. Talking with natural hand, body, and facial gestures can demonstrate an enthusiasm and interest in a position. Although a little nervousness is to be expected, avoid mannerisms that indicate tension or nervousness.
Exceptional speech is what employers expect from liberal arts students.
Use proper grammar and avoid slang and trite phrases. Speak clearly and expressively using your natural intonation to express feelings as well as thoughts. Attitudes come across loud and clear in projecting your image. Maintain a positive attitude without dwelling on negative aspects of your college experience. As already mentioned, you are to be an active participant in the interview - not a passive respondent to questions.