Hand on Cheek show evaluation and genuine interest.
Chin Stroking is the person making a decision. Don’t interrupt!
Seated Readiness shows excitement and agreement.
Head Tilt shows interest.
The one telltale sign that a person can never control is Dilated Pupils. When you are interested in something your pupils will dilate up to four times their size which shows excitement and interest.
See real life examples of these and more body language signs by picking up Anne Warfield’s DVD Communicating More Effectively: How to Read What a Person is Thinking But Not Saying!