
The following mentions can help you evaluate a person:
It is rightly said “The closer they are, the warmer they are thinking of you. The farther away that someone is, the less they actually care of the situation or person”[/i]
If you move slightly closer to them, do they move slightly further away? That means they don't want your interaction to be any more personal than it already is. [/i]
If they don't move further away, then they are receptive. And if they respond by getting even closer to you, they probably really like you or are very comfortable around/by you.[/i]
If someone lowers their head it is when he is complimented, he may be shy, ashamed, timid, keeping distance from the other person, in disbelief, or thinking to himself or herself. If it is after an explanation, then he may be unsure if what he said was correct.
If eyes seem far away indicates that a person is in deep thought or not listening.
People with crossed arms are closing themselves to social influence.
Arms crossed with shoulder wider apart denote position of toughness or authority.
Hands on hips imply waiting or impatient.
Movement of the foot means that the person is impatient, excited, nervous, scared, or intimidated.
Sitting feet crossed at the ankles means they're generally at ease
Cupping your face in one or both hands, with your eyes not really focused on any one thing, staring off into space is almost universally the sign of boredom.
Anxiety is associated with worry & stress by fatigue or anger. When you’re stressed out, you tend to squeeze your head with your hands.
When you’re confident you relax your body, and stand more upright tend to smile and breathe naturally.
Whatever you are doing, and however you feel, you almost always are broadcasting your feelings to the people around you.

Body language is said to play an important role during the interviews and hence this is the time when people pay more attention to their body language:
Hence the dos and don’ts s are
Do
Sit up straight, and lean slightly forward in your chair
Show your enthusiasm by keeping an interested expression.
Stand up and smile even if you are on a phone interview. Standing increases your level of alertness and allows you to become more engaged in the conversation.
Don’t:
Rub the back of your head or neck.
Rubbing or touching your nose suggests that you’re not being completely honest, and it’s gross.
Arms folded across your chest. You’ll appear unfriendly and disengaged.
A stare back blankly is often common when they are trying to distance themselves.
