The Eyes...

An important skills to master for a job interview is maintaining appropriate eye contact. Failure to make eye contact was the top body language mistake job seekers make. People who sustain extended eye contact are more likely to be perceived as intelligent and credible.

A strong posture will not only make you look more confidence, it can also help you feel more confident and perform better in your interview. 

Individuals who sit up straighter are more likely to view themselves as having strong leadership skills, whereas those with hunched postures have higher risks of feeling easily stressed.

Smiling at the beginning and end of your interview  but not as much in between  will make you seem more approachable and likable. It's all about balance.

Too much fidgeting will make you look anxious and nervous, which might cause your interviewer to question your assertiveness.

Dress up for the occasion. A simple trick is to try and match the energy or demeanor of your interviewer.  

Your handshake is the first and last impression you will make in a job interview. , A strong handshake can both diminish the impact of a negative impression and make a positive interaction even better.