A couple months ago I came to realize that many INFps are not particularly emotionally expressiveness. This was a bit of a surprise to me, because I had equated Fe with over the top (from my perspective) emotional expressiveness that I'd associated with Fe because of the... well, over the top (from my perspective) emotional expressiveness of Fe dominants and the seeming "I'm going to be cheery cheery cheery because everyone needs to be happy" or mindset of ISFps. (I admittedly do not have many good examples of ISFps though.)
I'd go as far as to say that many ExFps are more "emotionally expressive" than INFps, especially ESFps (from the perspective of the English language). Their emotional expression is different than that of Fe dominants, but it's more apparent than that of many INFps, regardless. There are also a lot of INFps who don't seem particularly warm. They just seem to very much dislike situations which are charged with negative emotion (such as people being pissed off at them, for example). When this type of situation arises, they may just try to excuse themselves from it, and they may incite the help of "stronger" people through emotional leverage (read that however you'd like to).
I recently read this description of Fe as the creative function, and it seems to fit with my observations.
http://wikisocion.org/en/index.php?t...nd.29_functionThe person is sensitive to the emotional atmosphere around him, either from an individual, or a group, or even from inanimate objects such as the landscape, the state of the physical environment he happens to be in, or his own emotional associations with the place or people around him. A positive emotional atmophere is essential for his sense of well being and inner peace, and he either tries to promote it himself by directly influencing it around him, or by simply moving away from the environment or the people causing a negative emotional environment in his view. For the SEI, this takes an on-the-spot aspect and is reflected in cracking jokes, trying to make people laugh, or simply moving away from people he perceives as affecting him negatively. For the IEI, this takes a longer-term perspective; so the focus, rather than being on the immediate emotional environment, is on the perceived longer-term emotional state of others towards the individual, and is reflected in trying to be on good terms with those he interacts with or seeking distance or protection from, or "preventively" attacking, those he sees as irremediably hostile emotionally.