The INFJ Body Language can be described in many ways. You can either look at the positive signals or the negative.
The INFJs inclination towards proactive leadership will make them appear cunning and deliberate when trying to organise and guide their environment. The reactive explorer signal will make INFJs appear more reserved and closed to information from the outside.
The innocent idealism manifests in dreamy and warm expressions. The bitter realism manifests in a signal of melancholy. NJs tend to have deliberate, focused gazes, but can appear nervous when there are sudden changes around them. FJs tend to have passionate expressions when arguing or using diplomacy with others, as if they believe their own words. Their inferior thinking and perceiving will however make them more careful and guarded in their use of thinking and perceiving.